[Stealhead]

Yeah 100 laps is alot unless you are a regular swimmer unless you are talking a fairly small pool.I would think that either the breast or butterfly stroke would burn the most but just starting off you are not going to do 100
or even 50 laps doing those.Freestyle is the best from a burn some calories but not wear your self out stand point.

I think I could maybe do 100 laps back when I was on the high school swim team all though there where never any events where one person had to swim 100 alone.Also the speed at which you are swimming the laps would have an effect.

Also not sleeping much is not healthy for anyone as a teenager you should be sleeping 8 or 9 hours a night I think I read some place that some teens need more than that a night.
Lack of or too much sleep can also be a sign of depression.Your brain needs good rest period they dont really know fully why the brain needs good rest but it does if you are only sleeping a few hours a night then something is wrong and you need to speak to a doctor or you are simply over working yourself in some way which is not healthy.