FitCi
Single-Leg Leg Extension is an isolation exercise for the legs: one joint works, so it comes after the compound lifts to finish the target muscle. Equipment: machine. Difficulty: beginner, suitable for beginners. It takes 5 steps; the most common mistake is covered in the tip below.
Step-by-step
- Sit on the machine, rest your back, and set the pad in front of one ankle
- Leave the other leg free and hold the handles
- Raise your leg until the knee is fully extended
- Squeeze your quad for one second at the top
- Lower the weight under control; finish all reps, then switch legs
Coaching tip
Working one leg stops the strong side from compensating; start with your weaker leg.
Caution
Skip this move or ask a professional first if you have pain or an injury in: knee. FitCi filters it out of your program automatically based on the injuries in your profile.
How to program it
Sets × reps and rest by goal; tempo and controlled reps matter most on isolation work. Start at the bottom of the range in week one; add 2.5–5% when you hit the top with clean form.
| Goal | Sets × Reps | Rest |
|---|---|---|
| Strength | 3 × 6-8 | 120 s |
| Muscle gain | 3 × 10-15 | 75 s |
| Fat loss / conditioning | 3 × 12-15 | 60 s |
FitCi applies this table to your age and goal automatically and writes weekly progression.
Alternatives
- At home, no equipment: Bodyweight Squat, Wall Sit
- Same muscle, different equipment: Barbell Back Squat, Front Squat, Goblet Squat
More legs exercises
Add this exercise to your program
Build your own program in FitCi, pick an expert template, or photograph the plan your coach gave you; the app tracks sets, reps and weight.