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Are you Karl Knopf, author of the books below?
Foam Roller Workbook by Karl Knopf Healthy Shoulder Handbook by Karl Knopf Resistance Band Workbook by Karl Knopf Stretching for 50+ by Karl Knopf Make the Pool Your Gym by Karl Knopf Core Strength for 50+ by Karl Knopf Weights for 50+ by Karl Knopf Heal Your Frozen Shoulder by Karl Knopf Beat Osteoporosis with Exercise by Karl Knopf Injury Rehab with Resistance Bands by Karl Knopf


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