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Most doctors, when you push them, will acknowledge that a small subset of humans are quite motivated to continue to exercise and will suggest what's reasonable vs. unreasonable and if/when to knock it on the head depending on your injury and what recovery is needed. It's not like cutting off body parts is an overuse injury so you're more likely to be given the ok to "do stuff" than not I reckon.
GWS!
Only collarbone breaks and riding the turbo in a sling. It's pretty sucky but good to move a bit of blood around. No intervals, I was just spinning the legs over.