You finish a set of dumbbell rows, then look at your log: "3 sets, 20 kg, 10 reps." Was that ten reps with each arm or ten in total? If one side stopped at eight, did you record that? Unilateral training sounds simple until it enters a workout plan and a tracking app. The details matter because you are doing work one side at a time.
Unilateral training uses one arm or one leg as the main working side. A single-arm row and a step-up are familiar examples. A two-arm row or a squat is bilateral. The American Council on Exercise (ACE) uses this one-side distinction. It is a way to select and organize exercises, and it works best alongside your bilateral lifts rather than instead of them.
This guide shows how to add one lower-body and one upper-body movement to an existing workout, how many sets and reps to start with, how to rest, which side to train first, how to progress, and how to log each side so the next session is easy to compare.
What Changes When You Train One Side at a Time?
In a bilateral movement, both limbs contribute at once. In a unilateral movement, one side has a turn, then the other. A set can therefore mean two distinct efforts, and the clock has to allow for both. The exercise may also demand more balance or trunk control, depending on the movement. A supported single-arm row, for example, asks less of balance than a single-leg squat.
That distinction prevents a common mistake: treating all single-side work as a balance challenge. You can choose a stable setup when the goal is to concentrate on the working arm or leg. You can choose a more demanding movement when balance itself is part of the plan. Neither choice is automatically superior; it depends on what you are trying to practice and whether you can keep the intended form.
So does unilateral work beat bilateral work? A 2023 meta-analysis by Zhang and colleagues pooled 28 studies of athletes who trained for 6 to 12 weeks. Unilateral training produced bigger gains in single-leg jumps and single-leg strength, plus a small edge in sprinting. On bilateral jump and strength tests it held no advantage, and the authors concluded that bilateral training suits those two-leg measures. Change of direction and balance showed no clear difference between the two. The pattern is specific: each style improves the kind of movement it trains most. That is a good reason to keep both in a program.
For the difference between movements that involve several joints and those that focus on one, see our compound versus isolation exercise guide. Unilateral and bilateral are a separate axis: a single-arm row can involve several joints, while a one-arm curl is more focused.
Pick One Lower-Body Movement
A step-up is one accessible way to start. One leg steps onto a stable platform and does the main lifting while the other follows. You then repeat on the other side. ACE lists box step-ups among unilateral lower-body options. Choose a height you can control, usually one where your thigh is about parallel to the floor or a little below when your foot is on the box, and use a stable surface.
Another option is a split squat or lunge, where the front and back legs have different roles. A split squat may feel more stable than balancing on one foot, while still allowing you to track each lead leg. If an exercise is unfamiliar, learn its technique from a qualified coach or the equipment instructions before adding load. Our dumbbell-only workout plan offers broader exercise choices.
To add the movement to a workout you already do, look at the lower-body slot it will occupy. If you have a squat and a leg press in one session, replace the leg press or another accessory with step-ups rather than attaching a full extra block to an already long workout. Decide how many sets fit your current plan, then make each set complete on both sides.
The first session is a baseline. Record the platform or variation, whether you held weight, and your actual reps per side. A bodyweight step-up and a step-up with two dumbbells are not the same comparison. Keep the setup recognizable the next time you perform it.
Pick One Upper-Body Movement
A supported single-arm dumbbell row is a clear upper-body example. One hand moves the dumbbell while the other hand or a bench provides support. Perform a controlled set on one side, then give the other side its own set. ACE includes single-arm rows among unilateral upper-body movements.
If your workout already contains a bilateral row, the single-arm row can replace one row variation rather than duplicate it. Alternatively, a one-arm press may make more sense if the upper-body session needs pressing. Choose an exercise that fits the session and equipment, then keep it for at least four to six weeks so you can compare your own sessions. Switching movements every workout makes the log harder to interpret.
The load entry needs a label. "20 kg" for a single-arm row usually means a 20 kg dumbbell in the working hand. "20 kg" for a pair of dumbbells could mean 20 kg in each hand or 20 kg total. Put the convention in your notes. Do not compare the number directly with a barbell row load; the implements and movement differ.
How to Program Unilateral Exercises
The numbers below are common starting points for healthy lifters adding single-side work to an existing program. Adjust them to your plan, but keep whatever you choose consistent for a few weeks.
Sets and reps
Start with 2 to 3 working sets per side for each unilateral exercise, and move to 3 or 4 once the movement feels familiar. Rep ranges depend on how stable the exercise is:
| Exercise type | Examples | Sets per side | Reps per side |
|---|---|---|---|
| Stable, easy to load | Supported one-arm row, one-arm cable row, split squat | 3 to 4 | 6 to 12 |
| Balance limits the load | Step-up, reverse lunge, single-leg Romanian deadlift | 2 to 3 | 8 to 15 |
| Small or isolation moves | One-arm lateral raise, single-leg curl | 2 to 3 | 10 to 15 |
Finish most sets with one to three clean reps still in reserve. Single-side work punishes a sloppy last rep with lost balance more than a machine does. Our guide to training to failure and RIR explains how to judge that margin.
Rest between sides and between sets
For upper-body moves, switch to the second side straight away; the setup change is enough of a pause. For heavy split squats or step-ups, take 15 to 30 seconds to reset your stance before the second leg. After both sides are done, rest 60 to 90 seconds for upper-body and lighter lower-body work, and 2 to 3 minutes for heavy lower-body sets. The rest between sets guide covers the reasoning behind those ranges.
Which side goes first
Start with your weaker or less coordinated side. If you cannot tell a difference, pick one side, usually the left, and keep that order in every session. A fixed order means fatigue affects the same side each time, so your numbers stay comparable from week to week.
Matching reps side to side
Let the first side set the number. If your left leg completes 9 clean step-ups, your right leg does 9, even if it could do 12. Matching keeps the work balanced while you build up the side that is behind. If the weaker side falls well short of the target on the same load, do not chase it with extra rushed reps; record what happened and repeat the load next session.
Some lifters add one extra set for the weaker side when the gap is large. If you do that, write it into the plan in advance and log it as its own set rather than adding it on a whim.
Progression
Use double progression. Pick a rep range, such as 8 to 12 per side. Start with a load that lets both sides reach the bottom of the range with clean form. Add reps over the next sessions. When both sides reach the top of the range on every set, move up to the next dumbbell, usually 1 to 2.5 kg heavier, and work back up from the bottom of the range.
For bodyweight step-ups and lunges, add reps first, then hold a pair of light dumbbells, then go heavier. Raise the box only once you have a load you can control. Change one thing at a time so the log shows what drove the improvement. Our progressive overload guide covers the other ways to make a lift harder.
Train each unilateral movement once or twice a week. The programs in the Zhang meta-analysis ran two to three sessions a week for 6 to 12 weeks, which is a sensible length for one training block.
Count Sets and Reps Per Side
Use a simple convention: one set per side means that each side performed one set. If your plan says three sets of step-ups, that means three right-leg efforts and three left-leg efforts. It does not mean each leg performed six sets. The actual time will include both sides, but the per-leg set count remains three.
An example log might look like this:
| Exercise | Set | Right | Left | Load note |
|---|---|---|---|---|
| Supported one-arm row | 1 | 10 reps | 10 reps | 20 kg dumbbell, one hand |
| Supported one-arm row | 2 | 10 reps | 9 reps | Same 20 kg dumbbell |
| Supported one-arm row | 3 | 9 reps | 8 reps | Same setup and load |
In WinGym, log the weight and the reps of the side that did fewer, then write "R 10 / L 9" in the set note. The reps field then never overstates what both sides managed, and the note keeps the full split. Use the session note for anything that applies to the whole exercise, such as "one 20 kg dumbbell, working hand" or "box 40 cm." For why consistent records matter, see tracking workouts and progress.
For a lower-body movement with two dumbbells, record the weight per hand and the implement count: "two 12 kg dumbbells." For one dumbbell held in front, record "one 12 kg dumbbell." In a bilateral lift, the barbell's displayed load is usually the total loaded bar. These are different accounting conventions; the log should say which one it uses.
You do not need to manufacture symmetry in the record. If one side gets fewer clean reps at the same load, write the actual reps. A later workout can then be compared honestly. Recording both sides also prevents the stronger side's number from becoming the only number you remember.
What If One Side Performs Differently?
Small differences in coordination, comfort or reps are normal on any given day. Start with a load and variation that allow controlled form on both sides. If one side loses the intended range or tempo, stop that side's set instead of adding rushed reps just to match the other column.
Watch the trend across several sessions rather than one workout. A gap of a rep or two that slowly closes while you match reps is the expected pattern. If a difference is new, painful, or linked to an injury, get it checked by a physiotherapist or doctor before you keep loading that side.
Fit It into a Real Session
Single-side work takes turns, so it takes more clock time than doing both sides together. Three sets per side of a step-up with 90 seconds of rest takes roughly 8 to 10 minutes. If time is tight, one well-chosen unilateral slot per session is easier to sustain than several. Keep the bilateral lifts that serve your goals and use single-side exercises where separate feedback per side is useful.
A simple two-day example:
| Day | Main bilateral lift | Unilateral slot | Sets × reps per side | Rest after both sides |
|---|---|---|---|---|
| Lower body | Back squat | Dumbbell step-up | 3 × 8 to 12 | 90 seconds |
| Upper body | Bench press | Supported one-arm row | 3 × 8 to 12 | 60 to 90 seconds |
Place the unilateral exercise after your main lift, while you are still fresh enough to control it but no longer need all your energy for the heaviest work. Your existing program and recovery decide how much else fits around it.
When you compare sessions, compare like with like: same movement variation, similar setup, the same load convention and actual per-side reps. If you change the platform height, dumbbell count or support position, note it. A higher number after a major setup change does not mean the two workouts were equivalent.
Good unilateral training is easy to recognize in a log: the movement is clear, both sides have a complete entry, the load means one specific thing, and the next session can be compared without guesswork.
Frequently asked questions
Which side should I train first?
Start with the weaker or less coordinated side, then match its reps with the other side. If you notice no difference, pick one side and keep the same order every session so fatigue affects both sides the same way each week.
Must I do exactly equal reps on both sides?
Plan an equal target and let the first side set the number. Do not turn a rough final rep into a clean one on paper. If the weaker side falls short, record the real split, such as "R 10 / L 8," and repeat the load next time.
How many sets of unilateral exercises should I do?
Two to three working sets per side per exercise is a good start, rising to three or four once the movement is familiar. One or two unilateral exercises per session is enough for most programs.
Will unilateral exercises double my workout time?
Each side needs a turn, so the exercise takes longer than a comparable two-sided movement. Replacing an existing accessory with one unilateral movement keeps the time cost to a few extra minutes instead of adding a whole block.
Should I stop bilateral lifts?
No. In the Zhang meta-analysis, unilateral training improved single-leg jump and strength more, while bilateral training suited two-leg measures. Keep both and give each slot in your plan the pattern it is meant to train.
