Former swimmer and athlete here, and it depends on how fast your metabolism is. In middle school and highschool I could eat and within 15-20 minutes I would jump in the pool and start swimming. After about 15 minutes of warm-up, I'd be good to really train and pick up the pace. Now that i'm older, I'm still active, lift, run, and sometimes swim but my metabolism is nowhere as fast (i'm 30). I need a good 4 hours after a big meal to even consider aerobic work out. If it's a light meal, probably 2 hours. If went back to working out competitively I think my metabolism would increase significantly but probably not as fast as it used to be when I was still in my teens.
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