If you mean you are only sleeping 3 hours per night, then yes it is bad.
But if you mean you exercise and then don't go to sleep within three hours later, then no that's not bad.
well you should at least get 60 minutes of exercise daily.
A child is supposed to get at least 1 hour of exercise a day or 7 hours of exercise a week.
At least 2 hours
To be healthy, the average person should exercise for at least one hour every day.
I think that people should get at least 2 to 3 hours of exercise every day :)
astronauts exercise everyday on the ISS for at least 2 hours to keep up bonce strenght and density.
once or twice a day, every day for at least 2 hours
i would do at least 2 hrs. a day for good results
at least 3 hours
A healthy person should get at least 1 hour of exercise in daily.
teenagers need to get daily exercise. some exercise is accidental exercise like walking from place to place. but teenagers need to get at least 1/2 and hour of proper exercise this includes, walking the dog, sport training, going for a run, sport games, etc teenagers also need to drink plenty of water and eat healthy.
At least 40 to 60 minutes a day. More is better, up to 2 or 3 hours.