Kettlebell Muscle: The Secrets of Compound Kettlebell Lifting—for Faster, More Efficient Gains in Strength and Power. Kettlebell Muscle is the doorway to intelligent hypertrophy training. It's a book about building muscle mass fast. Geoff's clever use of time is the factor for stunning muscle gains. The tools are simple, the moves are simple, the schemes are simple and the results are amazing. Click Image to order.