Kneel-type twisting sit-ups to exercise abdominal muscles
Lie on the mat, hold your hands behind your head, keep your legs lifted off the mat, and retract your left leg so that the knee joint and hip joint of the left leg are The joints are all at 90 degrees.
At the same time, bend forward and turn left, use your right elbow joint to touch the left knee joint as much as possible, and do this twice.
Then turn right and touch your right knee joint with your left elbow, also completing it twice.
Continue in sequence and do 60 seconds of bicycle-style sit-ups.
3 groups each time, 1 minute each.
