It depends on how far you’re willing to go. If you want to just cut a few inches off your waist, then I would recommend a lot of plank holds and V-Ups (Lay on floor and lift up your legs and arms, bending at the waist, until your hands touch your toes). Also, hollow rocks work very well (lay on your back with your arms above your head like you’re trying to cover your ears, and lift your legs off the ground). Doing that for 30 seconds at a time with 10 second break intervals is a great way to build your abdomen muscles.
The best are bicycles. Plank exercises and reverse crunches work very well too.
look for pilates and yoga videos on youtube
It depends on how far you’re willing to go. If you want to just cut a few inches off your waist, then I would recommend a lot of plank holds and V-Ups (Lay on floor and lift up your legs and arms, bending at the waist, until your hands touch your toes). Also, hollow rocks work very well (lay on your back with your arms above your head like you’re trying to cover your ears, and lift your legs off the ground). Doing that for 30 seconds at a time with 10 second break intervals is a great way to build your abdomen muscles.