I have one long break and really what passes the time is getting a magazine, and riding a bike for a while (I do it for around 1-2 hours) and then lifting some weights. You will find that the four hours really isn't a problem especially if you are there for around 2.5-3 hours, and then factor in some time for a shower, and having a meal. I find that after I do something like that the next class is also a bit easier as I am refreshed.
Reading your text also might be a good idea.
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