Knee Touch Crunches
The knee-touch crunch gives the classic crunch a measurable finish line: fingertips slide up to touch the knees at the top of every rep. That physical checkpoint keeps range honest, making it a smart first crunch variation for people learning what a full rep should feel like. Coached by Maddy (NASM-CPT) — these are the exact form cues he gives on every client's first week.
Muscles worked
Sets & reps by goal
| Goal | Sets × Reps | Rest |
|---|---|---|
| Strength | 4 × 6 (3-second pause at the touch) | 90 s |
| Muscle | 3–4 × 9–12 | 60–90 s |
| Endurance | 3 × 18–27 | 45–60 s |
Level — Beginner
Beginner — the knee touch is a built-in range referee; let it call every rep.
Proper form — 5 cues
- Lie back with knees bent, feet flat, arms extended along the thighs.
- Curl the shoulder blades off the mat, sliding the hands up the thighs toward the knees.
- Touch the knees — or the kneecaps' base — with both hands on every rep.
- Pause one beat at the touch, abs fully shortened, before lowering.
- Lower the shoulders down with the same control they came up with.
Breathing: Exhale as the hands slide to the knees, inhale on the controlled lowering.
The 3 mistakes Maddy corrects most
How to program knee touch crunches
| Goal | Phase | Sets | Reps | Tempo | Rest | RPE |
|---|---|---|---|---|---|---|
| strength | weeks 1–4 · build | 4 | 6 (3-second pause at the touch) | 2-3-2-0 | 90 s | 7 |
| strength | weeks 5–8 · intensify | 4 | 6 (4-second pause) | 2-4-2-0 | 90 s | 7–8 |
| strength | weeks 9–12 · peak | 4 | 6 (slow lower, long pause) | 2-4-3-0 | 90 s | 8 |
| hypertrophy | weeks 1–4 · build | 3 | 9 | 2-1-2-1 | 60–90 s | 7 |
| hypertrophy | weeks 5–8 · intensify | 4 | 10 | 2-1-2-1 | 60–90 s | 7–8 |
| hypertrophy | weeks 9–12 · peak | 4 | 12 | 2-1-2-1 | 60–90 s | 8 |
| endurance | weeks 1–4 · build | 3 | 18 | 2-0-2-0 | 60 s | 6 |
| endurance | weeks 5–8 · intensify | 3 | 22 | 2-0-2-0 | 45–60 s | 6–7 |
| endurance | weeks 9–12 · peak | 3 | 27 | 2-0-2-0 | 45 s | 7 |
| beginner | weeks 1–4 · learn | 2 | 8 | slow curl, hands sliding up the thighs | 60 s | 5 |
| beginner | weeks 5–8 · groove | 3 | 10 | touch the knees every rep | 60 s | 5–6 |
| beginner | weeks 9–12 · load | 3 | 10 (1-second pause) | 2-1-2-0 | 60 s | 6 |
Tempo = eccentric-pause-concentric-pause in seconds where numeric (X = explosive intent); pace/hold cues for interval and stretch drills.
Common questions
Are knee-touch crunches better than regular crunches?
Mechanically they are the same exercise; the knee touch simply adds an objective range marker. That matters more than it sounds — most self-taught crunches shrink over a set without the person noticing. If your reps already reach full range consistently, the touch adds a pacing rhythm, nothing more.
Why do I feel this in my neck?
Usually because the head is leading the movement instead of riding on it. Keep the gaze on the knees, imagine holding a small orange under the chin, and shrink the range until the abs — not the neck — do the lifting. Building up gradually beats pushing through neck strain.
How many crunches a day should I do for visible abs?
Visible abs are decided mostly by body-fat level, which training volume alone does not control — nutrition does the heavy lifting there. Train the abs like any muscle: two to four quality sets, two or three times a week, progressed over time, rather than daily high-rep marathons.
What is the difference between a knee-touch crunch and a sit-up?
Range, mostly. The crunch lifts only the shoulder blades, keeping the lower back on the mat, so the abs do nearly all the work through a short, concentrated arc. A sit-up continues to a full seated position, which recruits the hip flexors heavily for the second half and asks more of the lower back. Neither is wrong, but the crunch is easier to keep honest and kinder to most spines, which is why it is the sensible default for direct ab work — with the knee touch acting as a built-in range check.
Should my feet be anchored during crunches?
For this exercise, no. Hooking the feet under a sofa or having a partner hold them invites the hip flexors to yank the trunk up, which quietly steals the abdominal work the crunch exists for — and it usually drags the lower back into the movement too. Feet flat and unanchored keeps the abs honest: if you cannot curl up without the feet lifting, shorten the range and build up. Save anchored positions for exercises designed around them, not for crunches.
Related exercises
Harder: Crunches
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