They claim to tone your body, improve posture and ease back pain. Esther Walker reports. MBT trainers seem like an unlikely item of footwear to catch the imagination of the young and trendy. With their thick, curved sole and sensible wide straps, they look like the sort of thing you need to wear if one of your legs is shorter than the other. Despite their distinct un-beauty, MBT trainers have, for MBT walk shoes the last eight years, been cited as the answer to modern-day solution for anything from back problems to cellulite on your bum. Now look forward, not at your feet, and start walking briskly, but in a relaxed manner.