You could try starting at the top and lowering down… making a down+up=1rep rather than an up+down. Then you can be sure to not actually let your non-working foot rest.
They're prolly plyo boxes… or the equivalent. I use them at my gym for stepups (or did, pre-injury) and used the biggest one, and just started from the top. Huge range of motion, and no help from the other leg.
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