How do warm up and cool down activities differ?

To warm up I would do some stretches and to cool down I would drink some ice water or just jump in the pool. 

To warm up I'd suggest a quick jog or jumping jacks with scretching, and for a cool down try walking or jogging and don't forget to rehydrate.

Difference between normal and abnormal tissue is much clearer on mri than on ct and mri much suitable to view soft tissues