Jump rope is excellent aerobic exercise, and you don't need much room. Ten minutes of jump rope will get your heart racing!
Also, sometimes when I am hardcore studying for hours, I will start to get tired and drained. Instead of taking a nap (which is what I really want to do), I have tried taking 30 - 45 minutes to do a series of yoga poses and breathing. It re-energizes the body and mind without the groggy feeling that I get from a nap.
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