Single Leg Hack Squat Calf Raise
In SetGrip: Hack Squat Calf Raise (Single Leg)
- Primary muscleCalves
- EquipmentSled Machine
- DifficultyIntermediate
- TypeIsolation · Ankle extension
- Secondary muscles
- Hamstrings, Glutes
- Body part
- Lower Legs
- Position
- Standing
- Laterality
- Unilateral (one leg at a time)
- Category
- Strength
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Loading the hack sled but driving it with one leg gives you unilateral calf work at weights no dumbbell allows, with the machine's fixed track absorbing the balance problem that usually caps single-leg loading. Start with about half your two-leg sled weight and expect one side to lag behind the other.
How to do the Single Leg Hack Squat Calf Raise
- Adjust the sled machine to an appropriate weight.
- Stand on the sled machine with one foot, keeping the other foot off the ground.
- Hold onto the handles for stability.
- Raise your heel as high as possible, lifting your body up on the ball of your foot.
- Pause for a moment at the top, then slowly lower your heel back down to the starting position.
- Repeat for the desired number of repetitions.
- Switch legs and repeat the exercise.
Tip: Count two seconds up, hold one at the top and take three seconds down.
Muscles worked
Primary
Calves · Legs
Standing raises target the gastrocnemius while seated raises target the deeper soleus; either way you should feel a hard cramp-like squeeze at the top and a strong stretch at the bottom.
Secondary
- Hamstrings — The hamstrings only stabilize here — it is the gastrocnemius that shares the knee-crossing role, so straight legs keep it loaded while bent knees hand the work to the soleus.
- Glutes
Common mistakes
- Bouncing out of the bottom — the Achilles tendon does the work if you rebound; pause at the bottom of the stretch for a count before pressing up.
- Cutting the range short — go all the way down until you feel a full stretch in the calf and all the way up onto the big toe.
- Rolling onto the outer foot — drive through the big toe side of the ball of the foot to keep the whole calf working.
- Too heavy, too fast — calves handle high loads but they respond to controlled reps with a slow descent, not bouncing partials.
Sets, reps and where it fits
| Goal | Sets × reps | Rest |
|---|---|---|
| Muscle growth | 3–4 × 10–15 per side | 60–90 s |
| Endurance / finisher | 2–3 × 15–20 per side | 45 s |
| Strength | Not ideal — pick a compound lift for the same muscle | — |
Calf raises go at the end of a lower body session or between sets of an upper body lift. Superset seated and standing raises to hit both parts of the calf back to back.
Variations and alternatives
Similar exercises
Without sled machine
Frequently asked questions
What muscles does the Single Leg Hack Squat Calf Raise work?
The Single Leg Hack Squat Calf Raise primarily works the calves. It also involves the hamstrings and glutes, which assist the movement and stabilise the joints.
Is the Single Leg Hack Squat Calf Raise good for beginners?
It is rated intermediate, so it suits people who already train regularly. Beginners can still do the Single Leg Hack Squat Calf Raise with light load and a spotter or coach watching the first few sessions; if it feels awkward, pick an easier variation from the alternatives below first.
What can I do instead of the Single Leg Hack Squat Calf Raise?
If you cannot do the Single Leg Hack Squat Calf Raise, try the Single Leg Donkey Calf Raise, the Bench Donkey Calf Raise or the Supported Standing Calf Raise. Each of them trains the calves through a similar movement, so you can swap them in without changing the rest of the workout.
How many sets and reps should I do?
It depends on your goal. For the Single Leg Hack Squat Calf Raise, a sensible starting point is muscle growth: 3–4 × 10–15 per side with 60–90 s rest; endurance / finisher: 2–3 × 15–20 per side with 45 s rest. Do it after your compound lifts. It is a finishing movement, not the main event.
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