I would say a because he ran too much but that would be just me I think he hurt his knee from running too much more exercise but probably just aggravate his condition I could be wrong but this is what I think
Answer:
Starting a fitness program may be one of the best things you can do for your health. Physical activity can reduce your risk of chronic disease, improve your ... using a weight or resistance level heavy enough to tire your muscles after about 12 to 15 ... In high-interval intensity training, you perform short bursts of high-intensity ...
Explanation:
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