bStay young, improve your mobility and prevent injury with the bestselling fitness guide for core strength training for 50-plus from Dr. Karl Knopf.b pFrom swinging a golf club to carrying a bag of groceries, the core is everything. Balance, agility and youthful stature are just a few of the benefits of a toned and powerful midsection. iCore Strength for 50i has everything you need to p b- Improve posturebr - Enhance sports performancebr - Guarantee low back healthbr - Avoid injuryb p With workouts ranging from basic mat work routines to unstable training with foam rollers and stability balls, iCore Strength for 50i provides more than 75 exercises that build and maintain strong muscles in the abs, obliques, lower back and butt.