TETSUCable Concentration Extension (On Knee) vs Side Push-Up
The Cable Concentration Extension (On Knee) and the Side Push-Up both train the triceps as their primary muscle. The Cable Concentration Extension (On Knee) uses a cable while the Side Push-Up is bodyweight-only. Here is how they compare and when to pick each.
Side-by-side comparison
| Cable Concentration Extension (On Knee) | Side Push-Up | |
|---|---|---|
| Primary muscle | triceps | triceps |
| Body part | upper arms | upper arms |
| Supporting muscles | forearms | shoulders, chest and core |
| Equipment | cable | bodyweight |
| Steps in our guide | 5 | 6 |
How each one starts
Cable Concentration Extension (On Knee) — first steps
- Sit on a bench or chair with your knees bent and feet flat on the ground.
- Hold the cable handle with your right hand and place your elbow on the inside of your right knee.
Side Push-Up — first steps
- Start by lying on your side with your legs extended and stacked on top of each other.
- Place your bottom hand on the ground directly under your shoulder, fingers pointing forward.
Full step-by-step guides are linked below.
Which should you choose?
The Cable Concentration Extension (On Knee) keeps constant tension on the muscle through the whole range of motion. The Side Push-Up needs no equipment and scales through leverage, tempo and reps. If your gym has both options, neither is a wrong choice: pick the one that feels strongest through a full range, and swap after 6 to 8 weeks to keep the triceps adapting.
Full form guides
Common questions
Is the Cable Concentration Extension (On Knee) better than the Side Push-Up?
Neither is universally better — both train the triceps as the primary mover. The Cable Concentration Extension (On Knee) keeps constant tension on the muscle through the whole range of motion, while the Side Push-Up needs no equipment and scales through leverage, tempo and reps. Choose based on your equipment and which movement you can progress consistently.
Can I do both the Cable Concentration Extension (On Knee) and the Side Push-Up in the same program?
Yes, but usually not in the same session — they overlap heavily on the triceps. A common setup is one as your main movement and the other on a second training day, or alternating them block by block.
Do the Cable Concentration Extension (On Knee) and the Side Push-Up work the same muscles?
The primary muscle is the same: the triceps. Supporting muscles differ slightly — forearms for the Cable Concentration Extension (On Knee) versus shoulders, chest and core for the Side Push-Up.
Track it in Tetsu
Tetsu tracks both movements separately, keeps your PRs per exercise, and tells you which one is actually progressing. Free to start.