What exercise can I do at home without having to purchase any equipment?

I don’t exercise alot at school as I’m pretty shy so I was just wondering what kind of exercise I can do at home. I’m not overweight & I don’t look overweight. People have commented that I have nice legs and I really want to keep it that way So please help! I need some kind of exercise I can do to keep my legs in shape and my tummy flat ^^

All nice & helpful answers would be appreciated!

What exercise to do everyday at home to have better endurance?

I would just like to know what exercise could I do everyday at home to have better endurance(endurance for running)? And is stretching done only in the beginning of the exercise or after the exercise?

Thanks in advance!
I have a lot of snow outside of my house, so I can’t run outside,
but I’m looking for an exercise that can be done inside the house and that doesn’t require any equipment, if possible,
Thanks

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