Build muscle with strength training
Lose weight gradually
Stay hydrated
Eat enough protein
Use sunscreen on the area
Apply moisturizer regularly
Try retinoid creams if appropriate
Maintain stable weight
Improve posture
Consider radiofrequency treatments
Consider ultrasound skin-tightening treatments
Consider laser treatments
Consider microneedling
Consider body contouring procedures
Consider abdominoplasty if excess skin is severe
Consult a dermatologist
Consult a plastic surgeon