Thin people should not do so much aerobic exercise, or they will get thinner as they practice. Aerobic exercise includes: running (jogging), swimming, boxing, cycling and so on. Thin people should do more anaerobic exercises: they are all muscle exercises, such as push-ups and sit-ups. If you need equipment, it is dumbbell and barbell training, from dumbbell shrugging to barbell pressing, to barbell bending, and finally to legs. Thin people should exercise more muscles. Hope to adopt, thank you!