Got to screw up a good thread hijack.
Right after basic training (Army in the middle of summer) I went to my job training. I was there for about 2 1/2 months when I got to start going to boxing 3 days a week (my reward for being better at PT than my entire platoon). I don't know whether it was because my body had already been taken to the ultimate limit months before but I didn't see boxing as all that hard. I had already went through many months of endurance training. I really enjoyed it though. I did group training (shadow boxing, etc). I'm sure it would have been harder if I would have actually boxed with someone.