Launching Next has discovered 2 muscle building startups.
Fit Gurus
Serious Gym Training - For Fat Loss and Muscle Building
Men's Health Magazine : Men's Guide to Fitness, Health, Weight Loss, Nutrition, Sex, Style and Guy Wisdom
Tons of useful stuff. The men's guide to fitness, sex, women, workouts, weight loss, health, nutrition and muscle building from the world's largest men's magazine.