Build muscle with strength training
Lose body fat gradually
Eat enough protein
Stay hydrated
Use sunscreen on exposed skin
Avoid smoking
Maintain stable weight
Improve posture
Try topical retinoids if appropriate
Consider radiofrequency treatments
Consider ultrasound skin-tightening treatments
Consider laser treatments
Consider microneedling
Consider body contouring procedures
Consider a tummy tuck for significant loose skin
Consult a dermatologist or plastic surgeon