Go do Yoga. Please, you will thank me later.
I used to think it was slooooooooooowwwwwwwww and worthless. All the stillness, stretching, meditating, weird positions you had to get into.
I HAVE CHANGED MY MIND!
It is great to get the hell away from your mind*, and stretch and relax a screwed up back.
Plus, you are out of the house for over an hour and a half and, gasp, by yourself.
*which is full of child, husband, house, work, computer, phone, washing machine, bills