TV infomercials offer a world of potential solutions for back pain, but most of them have at least one of three problems — they’re unproven, unworkable or just plain unattractive. A team of Vanderbilt University engineers is changing that with a design that combines the science of biomechanics and advances in wearable tech to create a smart, mechanized undergarment. A performance-boosting super-suit is low-profile enough to fit underneath clothing (Joe Howell / Vanderbilt)Their device gets its U.S. debut Aug. 8-11 at an American Society of Biomechanics conference in Boulder, Colorado. The team unveiled itlast week at the Congress of the International Society of Biomechanics in Brisbane, Australia, garnering a Young…