Buku yang Dikarang by Karl Knopf

Healthy Shoulder Handbook

Kettlebells for 50+

Stretching for 50+

Resistance Band Workbook

Beat Osteoporosis with Exercise

Foam Roller Workbook

Injury Rehab with Resistance Bands

Weights for 50+

Core Strength for 50+

Make the Pool Your Gym

Heal Your Frozen Shoulder

Trigger Point Therapy with the Foam Roller

Foam Roller Workbook

Healthy Hips Handbook

Healthy Shoulder Handbook

Stability Workouts on the Balance Board

Ab Wheel Workouts

Therapy Ball Workbook

Make the Pool Your Gym, 2nd Edition

Total Sports Conditioning for Athletes 50+