Hula hoop, be sure to choose the kind with weight.
2
Side-lying sit-ups are definitely side-lying, and the effect of front-facing sit-ups is halved.
three
Mountain biking is definitely the best. My stomach and thighs are getting thinner. Haha, my mother has been insisting, and it will take effect in a week.
I tested all three of them myself. Haha, summer is here. Go by bike.