Who this program suits
The program suits everyone: a gym-goer as a finisher after regular workouts, or a home trainee as a standalone routine. The routines cover the core's three jobs: bracing, flexion and rotation control.
Squats and deadlifts already load the core, but direct core work adds measurable strength and muscle on top — especially if abs are a development target.
Who this is not for
- If the goal is visible abs from training alone: visibility is decided by body fat, and that comes down to diet.
- As your only training program: core work complements gym training but does not replace squats, pulls and presses.
- During acute lower-back pain: find the cause before adding flexion and rotation work.
Three routines as tables
Do the routines 2-3 times a week, as a standalone session or at the end of a gym workout. 3 sets per exercise; planks use time instead of reps.
Routine A: bracing
| Exercise | Sets | Reps | Rest | RPE |
|---|---|---|---|---|
| Plank | 3 | 30-60 s | 45 s | 8 |
| Side plank | 3 | 20-45 s / side | 45 s | 8 |
| Dead bug | 3 | 8-12 / side | 45 s | 7 |
| Bird dog | 3 | 8-10 / side | 45 s | 7 |
Routine B: flexion
| Exercise | Sets | Reps | Rest | RPE |
|---|---|---|---|---|
| Cable crunch | 3 | 10-15 | 60 s | 8-9 |
| Reverse crunch | 3 | 10-15 | 45 s | 8 |
| Bicycle crunch | 3 | 12-20 / side | 45 s | 8 |
Routine C: hanging and rotation
| Exercise | Sets | Reps | Rest | RPE |
|---|---|---|---|---|
| Hanging leg raise | 3 | 8-12 | 60 s | 8-9 |
| Kettlebell Russian twist | 3 | 10-16 / side | 45 s | 8 |
| Mountain climber | 3 | 30-45 s | 45 s | 8 |
Exercise techniques and animations are in the exercise library: browse all exercises · RPE 7 = about 3 reps in reserve, RPE 8 = 2, RPE 9 = 1.
Weekly calendar
Example for someone training three gym days: a routine at the end of each session. Home trainers can do the routines as standalone 15-minute sessions on the same days.
- MonRoutine A (end of gym session)
- TueRest
- WedRoutine B (end of gym session)
- ThuRest
- FriRoutine C (end of gym session)
- SatRest
- SunRest
Progression over weeks 1-8
The core develops with the same progression as every other muscle. On planks progression is duration and lever length, on crunches added load, on hanging raises range of motion from bent knees to straight legs.
| Weeks | Sets | Load | Note |
|---|---|---|---|
| Weeks 1-2 | 2 sets per exercise | RPE 7, easiest variants | Plank from the knees if needed, leg raises with bent knees. |
| Weeks 3-4 | 3 sets | RPE 8 | Plank duration +10 s per week; add load to crunches once you hit 15 reps. |
| Weeks 5-7 | 3 sets | RPE 8-9, harder variants | Straight-leg raises, side plank with a leg lift, heavier kettlebell. |
| Week 8 | 2 sets (deload) | Easier variants | Recovery week, then a new block from your week 7 level. |
How the program works
The core is a muscle group like any other: it needs progressive overload to develop. In planks the progression is duration and leverage, in crunches added weight, in hanging raises range of motion from bent knees to straight legs.
Visible abs are decided by body fat percentage, not rep count. Training builds the muscle, diet reveals it — do both at the same time.
Fifteen minutes is enough when movements are controlled and taken close to fatigue. Long sets of dozens of reps only tell you the exercise is too easy.
Sources
- Schoenfeld, Ogborn & Krieger 2017, Journal of Sports Sciences: weekly set count per muscle group has a dose-response relationship with hypertrophy.
- Helms et al. 2016, Strength and Conditioning Journal: a reps-in-reserve based RPE scale for regulating load in resistance training.
Free workout program by SisuLift. https://www.sisulift.app/en/workout-programs/core-workout-program
