Doing aerobic exercise, morning running is the most effective, and jogging for half an hour every day is enough.

What else is doing sit-ups? Divide the girls into groups 15-25, and then rest, 3-4 groups at a time, 2-3 times a week, without too much, do it quickly! Fast exercise consumes fat! Slow sit-ups will not reduce fat, but will only increase abdominal muscles.

PS: You insist!