A ski erg can be great for that, but with the best form, you would still rise up on your toes for each stroke. You can modify by kneeling when using it, so you can still hinge at your hips to get more power from each pull, without any calf strain at all. You can also do it sitting, but you'll lose more power because your hips won't be able to hinge as much, either.
If you have a rower, you can use something like a skateboard to prop your bad leg on to roll back and forth, and just row one-legged. I did that for about two months when I had a torn achilles!
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