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.
Tim FerrissThe best results I have had in my life; the most enjoyable times, have all come from asking the simple question: 'What is the worst that could happen?'
Tim FerrissBut you are the average of the five people you associate with most, so do not underestimate the effects of your pessimistic, unambitious, or disorganized friends. If someone isn't making you stronger, they're making you weaker.
Tim Ferriss