If it's a woman, don't cut it so much.
I'll tell you my method.
Lie on the bed and lift your legs up 90 degrees, 60 degrees and 30 degrees in turn.
3 is a group, and once insisted that 10 seconds is a group of ***30 seconds.
Just do the 10 group one day.
That's how I lost weight. The effect is good, but I'm a little tired. I learned it when I was studying yoga.