Lift free weights, start young, make it a life-long habit before your strength starts to wane with age. Look up Alan Thrall on YT for some vids on good form fo

Lift free weights, start young, make it a life-long habit before your strength starts to wane with age. Look up Alan Thrall on YT for some vids on good form for the basics like bench press, overhead press, dead-lift, squats, etc. that and core strength work and stretching should keep your posture in good shape.