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Leg extension alternatives

Supported sissy squats and reverse Nordic curls offer bodyweight knee-extension options. A single-leg extension uses the same machine, while a goblet squat can fill a broader quad-training slot.

Keep knee-extension work when that is the purpose of the slot. Bodyweight options change the setup and difficulty; a squat adds hip movement and does not reproduce the seated isolation exercise.

Two frames of the same anatomical illustration, side by side, of a man doing a two-legged leg extension on a plate-and-stack machine. He sits against a near-upright backrest holding the handles at his sides, shins behind the roller pad. In the left frame his knees are bent to about a right angle with the pad down by his ankles; in the right frame his knees are locked straight and his legs are horizontal, feet off the floor, the weight stack raised behind him. The quadriceps on both thighs are shaded red in both frames, as one group rather than a single head; the rest of the musculature is left grey.
What equipment can you use?

Choose everything you have. Some exercises need two items, such as dumbbells and a flat bench. Choose floor space for options without equipment.

Your replacements

Choose your equipment above to see replacements.

Compare all alternatives

These options need different equipment. Use the finder above to show only the setups you can use.

  • Anatomical illustration of a supported bodyweight sissy squat at the standing and lowered positions, with the quadriceps highlighted.

    Similar movement

    Sissy squat

    You need: Stable support to hold for balance

    Why it fits
    Keeps knee extension as the main action for a quad-focused exercise, without a leg extension machine.
    What changes
    You stand on the balls of your feet and lean back while holding a stable support for balance. Bodyweight and the amount of lean set the difficulty, rather than a weight stack.
    See exercise guide
  • Two side views of a woman performing a reverse Nordic curl on a mat: tall kneeling on the left and leaning backward with her hips straight on the right. The quadriceps are shaded red.

    Similar movement

    Reverse Nordic curl

    You need: Padded floor mat

    Why it fits
    Uses knee extension to bring the body back from a backward lean, giving a quad-focused option on the floor.
    What changes
    You kneel on padding with your hips extended, rather than sit with your hips bent. Start with a small controlled lean; there is no machine stack to reduce the starting resistance.
    See exercise guide

  • Similar movement

    Single leg extension

    You need: Leg extension machine

    Why it fits
    Keeps the seated, supported knee-extension setup and lets each side use its own load.
    What changes
    This still needs an available leg extension machine, so it does not solve a missing-machine problem. Complete and log reps for each leg, with a new load for the single-leg version.
    See exercise guide
  • Anatomical illustration of a woman holding one dumbbell at her chest while performing a goblet squat, with the thighs and glutes highlighted.

    Different movement

    Goblet squat

    You need: Dumbbells or Kettlebell

    Why it fits
    Can provide general quad training using a weight held at the chest when a knee-extension setup is unavailable.
    What changes
    Both the hips and knees move, and the torso has no backrest. This changes the exercise and muscle demands; it is a broader leg-training option rather than a direct isolation replacement.
    See exercise guide
See the original exercise guide

How we choose replacements

These are curated alternatives, chosen for the movement and the job the exercise does in a workout. A shared muscle group is not enough. Read what changes before choosing: support, range of motion, balance and resistance can all differ. If your goal is to improve a specific lift, alternatives do not replace practice of that lift.

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