Improvised Isometric Exercise Devices - The Climber's Sling: How a Simple Climber's Sling Can Become a Powerful Improvised Isometric Exercise Device or IIED

Improvised Isometric Exercise Devices - The Climber’s Sling: How a Simple Climber’s Sling Can Become a Powerful Improvised Isometric Exercise Device or IIED

The 70 Second Difference: The Politically Incorrect, Brutally Effective, and Occasionally Amusing Guide to Exercise, Diet, and Getting into Shape FAST