Tim Ferriss Quotes
When you elevate the heels more so than you elevate the sole of the foot, you trigger a cascade of compensations in the knees and hips that cause tight hip flexors, and then those hip flexors cause lower-back pain.
Citations
Ferriss, Timothy. The 4-Hour Body: An Uncommon Guide to Rapid Fat-Loss, Incredible Sex, and Becoming Superhuman. Crown Archetype, 2010.
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Timothy Ferriss is an American entrepreneur, investor, author, and lifestyle guru.