Place active leg against heel padding and other leg in the knee rest.
Lift up until your foot almost touches your glutes.
Lower back down to just before full extension.
Fully extending your leg.
Dropping the weight on the way down.
Moving your body throughout the movement.
Set up by placing your active leg's lower calf against the padding and place your other leg into the knee padding.
Start the curl by lifting your foot up towards your glutes as far as comfortable, then slowly lower the weight back down in a controlled manner to just before full extension. Keep your foot in a fixed position throughout the curl. Use the grips and brace your core to stabilise the upper body. Repeat for the desired amount of repetitions then switch sides.
Avoid the use of excessive momentum to swing the weight up or drop it down.