i joined my school gymnastics team last year and am finally able to do a side split~
well, for all those who want to learn.
try stretching regularly. like after waking up. usually, i do:
1. butterfly stretches, put your feet together and bring your nose as close to the floor as possible. hold.
2. put your legs together and reach for your toes. hold.
3. spread your legs as wide as you can, as if trying to do a split. bend as low as your body allows and hold.
you may want to have someone to hold on to while trying to hold the position. also, it would be a good idea to jog awhile to warm up your muscles.
good luck then.