cardio with a stress fracture?

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so I have a stress fracture in my foot, the doc says its right on the end almost a bone chip and I just have to take it easy and hope it heals. thankfully, I don't have to wear a boot - it sounds like if it doesnt heal they'd just remove the offending portion (of the bone, not the foot ;)

this has cramped my weight loss - I was down 20 lbs in about 35 days, now I'm spinning my wheels it seems for the last week without a cardio componant to my workout.

any ideas?