Guides / Which Muscles Is Your Workout Missing?
The muscles your workout is probably missing
Every "most neglected muscles" article gives you a list and no arithmetic. This one gives you the arithmetic: we ran a textbook five-lift routine through the same coverage engine the app uses and measured what each of 18 muscle groups actually received.
Updated 2026-08-19
The test: five lifts, measured
Take the routine almost every beginner programme recommends: back squat, Romanian deadlift, bench press, lat pulldown, seated row. Five compounds, about 18 minutes of work, and on paper it hits everything.
Measured against a full session's target for each of 18 groups, it reaches 10 of them. Here is what the other eight received:
| Muscle group | Share of one session's target |
|---|---|
| Side delts | 0% |
| Abductors (outer hip) | 0% |
| Calves | 10% |
| Obliques | 10% |
| Abs | 15% |
| Front delts | 40% |
| Triceps | 50% |
| Adductors (inner thigh) | 60% |
Two of those are not "a bit light". They are zero: nothing in that session loads the side deltoid or the hip abductors at all. The rest are the difference between training a muscle and touching it.
Why these six keep getting missed
The pattern is not random, and it is not laziness. Each of these is missed for a structural reason.
They have no compound that covers them. Side delts are the clearest case. A bench press is a front-delt movement, an overhead press is a front-delt movement; the lateral head only takes real load when the arm moves out to the side, and no multi-joint lift in a normal routine does that. Same for the Abductors (outer hip): hips abduct in almost nothing you would call a main lift.
They get assisted, and assistance is mistaken for training. Abs and Obliques work hard bracing a squat, and that genuinely counts - an assisting muscle is a real fraction of a set Pelland 2025. But a fraction is what it is. Measured, bracing through five compounds delivers about 15% of what one session should give the abs.
They are boring, and the mirror does not ask for them. Calves, Forearms and the Adductors (inner thigh) are the classic examples. They are also the ones people are most confident they are "getting enough of", because they are working during other lifts - the same fraction-of-a-set error as above.
The fix is not more exercises
The instinct is to bolt on more work: curls, pushdowns, a couple of extra sets. Measured, that does almost nothing - we tested it. Adding a barbell curl to the six-lift version of this routine moved the on-target count by zero, and adding a triceps pushdown on top of it also moved it by zero, because the compounds were already covering both arms adequately. The five groups still short were the five nobody adds.
The fix is different exercises, not more of them, and there are usually only three or four to add. One lateral raise closes Side delts. One hip abduction movement closes the abductors. One calf movement, one loaded rotation for the obliques, and the routine is complete - not because we like long sessions, but because those are the specific holes.
Check your own routine
None of the above is a claim about your programme. If you want the same measurement for what you actually do, the free coverage checker takes the movements you train, runs them through this engine and shows which groups fall short. It runs entirely in your browser: nothing is sent anywhere and there is no signup.
The two thresholds it uses are the app's own. A muscle counts as covered at 90% of a session's target or better, and every assisting muscle is counted as a fraction of a set rather than a whole one Pelland 2025 - so an exercise that "sort of" trains something is scored as sort of training it.
The short version: the muscles routines miss are the ones with no compound to hide behind - Side delts, Abductors (outer hip), Calves, Obliques, Adductors (inner thigh) and direct Abs work. Three or four targeted movements close all of them.
Related guides
How Many Exercises Per Workout?
The usual answer is 4-7 exercises. Measured against every muscle group, that leaves a third of them short - and the exercises people add next fix none of it.
Full-Body Workout That Hits All 18 Muscles
A compound-first, 10-exercise full-body routine built to load quads, hamstrings, chest, back, shoulders, arms and abs - all 18 groups - in one session.
How Many Sets Per Muscle Per Week?
The weekly set ranges the research supports, what counts as a set when an exercise only assists a muscle, and the ceiling on what one session delivers.