Direct answer
Picture the last twenty minutes of a session that already included squats, a press, and a row. The rack is free, you are tired, and the phone offers six “must-do” finisher circuits. Accessory work earns its place only when those extra sets support the lifts you are trying to improve, or add weekly work for a muscle the main lifts are not covering. Everything else is entertainment.
The 2026 ACSM position stand’s primary recommendation is practical: healthy adults should resistance-train with high effort at least twice a week, with all major muscle groups involved. Strength was enhanced when the important work sat at the beginning of the session. Hypertrophy was enhanced by higher weekly volume, on the order of 10 or more sets per muscle group per week. Accessories are how you fill a gap in that week. They are not a second workout you bolt on because the main work felt too short.
Put the main lift first, then ask what is missing
Exercise order showed up for strength in the ACSM overview: the work at the start of the session tended to benefit. If the squat, the press, or the pull is the point of the day, do it while you can still brace and still hit the range of motion you want. Accessories come after that, when a miss will not wreck the lift you came for.
Then ask one question: which region did the main work leave under-trained? A squat day may still need a hamstring curl or a hip hinge if the squat is very upright and the back of the thigh barely shows up. A bench day may still need a row if the only pulling you did was a warm-up band. A pull-up day may still need a triceps or rear-shoulder set if those areas are the ones that stall your lockout or your shoulder comfort. If you cannot name the gap, you do not need another exercise. You need to go home.
Choosing a training split you will follow decides how many days those gaps have to fit into. A three-day week has less room for accessories than a five-day week. The weekly sets still have to be sets you recover from. ACSM notes that healthy adults should complete at least two sets per exercise, that more than two may help, and that the benefit likely diminishes as sets accumulate. A meta-regression discussed in the stand showed diminishing returns past roughly 2–3 sets per exercise for strength and past roughly 18–20 weekly sets for hypertrophy. Those figures are a caution about piling on, not a quota you must hit on every muscle every week.
A filter that rejects most of the internet
Run a candidate exercise through four checks.
It trains a muscle or a motion the main lift does not. A second squat variation after heavy squats can be useful if it changes the range or the load you can control. A second squat variation that is just a worse squat is junk volume.
You can do it for clean reps when you are already tired. If the only way to finish the set is to heave, shorten the range, or hold your breath until you are dizzy, it does not belong at the end of the day. Joint-friendly pressing variations is the detour when a press is the thing that falls apart, not an excuse to add three more painful presses.
It has a job for the next month. “I like the pump” is a feeling, not a job. “My pull-ups stall because my arms give out” is a job. Write the job in the log in one line. If you cannot, delete the exercise.
It does not steal the next session. If leg extensions today make tomorrow’s squat a limp, the extensions lost the argument. Soreness is not a trophy. The next main lift is the trophy.
You might be thinking more exercises prove you worked hard. They prove you stayed longer. The ACSM overview is about the sets and the effort that drive strength and size, not about the number of machines you touched.
Illustrative menus, not prescriptions
These are shapes. They are not results from a trial and they are not loads. Swap anything that bothers a joint.
| Main lift you already did | One accessory that often earns the slot | One that usually does not |
|---|---|---|
| Squat | A leg curl or a hip hinge for 2–3 sets | A drop-set marathon of six quad machines |
| Bench or overhead press | A chest-supported row, then a light triceps set | A burnout of push-ups to failure after the press already slipped |
| Deadlift or pull-up | A row you can pause, or a carry if grip was the limiter | A biceps contest that leaves the elbows angry for the next pull |
| Any day, if a muscle group is still short of weekly work | 2–4 plain sets for that group | A new exercise you cannot coach yourself through |
Two to four accessory movements is plenty for most sessions. Each can live at 2–3 sets. That is enough to matter and small enough that you can tell, two weeks later, whether it helped. Progressive overload without ego lifting applies here too, but slower than on the main lift. Add a rep or a small load only when the set still looks like the set you want. Do not progress twenty exercises at once or you will not know which one you failed to recover from.
Single-joint work is allowed to be boring
The ACSM overview did not have enough evidence to say that single-joint work beats multi-joint work for hypertrophy, or the other way around. Curls, lateral raises, and calf raises are not morally inferior. They are tools for a region a compound lift under-doses. They earn the slot when that region is actually the goal. They fail the slot when they replace the compound you were avoiding.
Keep the range honest. A half-curl with a heavier dumbbell is not more accessory work. It is a shorter rep. Full range enhanced strength in the reviews ACSM included. Where the evidence on range and hypertrophy was thinner, the practical rule is still the same: use a range you can repeat next week, and do not chase a load that deletes that range.
Machines are fine. Free weights are fine. The stand did not find a consistent winner between them for strength. Pick the one you can load in small steps and set up without help if you train alone.
When to cut accessories first
If sleep is short, if a joint is cranky, or if the main lifts have stalled, accessories are the first sets to shrink. Keep one or two that match a real gap. Park the rest. Sleep as a training variable explains why a tired week is a bad time to add a finisher.
If you are new, you may not need a long accessory list at all. The main lifts already cover a lot of muscle if you do them two or three times a week with clean reps. Add one accessory per session when a specific gap shows up in the log, not on day one because a template had twelve lines.
Sharp pain is a stop. An accessory that reproduces a pinch in the shoulder, elbow, or knee does not “build the stabilizer.” It irritates the joint. Swap it or skip it, and get a clinician involved if the pain persists or you already have an injury.
Look at your last session and name the one accessory that had a job. If you cannot name it, what will you delete next time so the main lift stays first?
Sources
- Currier BS, D’Souza AC, Fiatarone Singh MA, et al. American College of Sports Medicine position stand. Resistance training prescription for healthy adults: an overview of reviews. Med Sci Sports Exerc. 2026. Summary for coaches and lifters. Journal.
Coaching education for healthy adults. Extra exercises do not treat pain, and this page is not a personalized routine.