The business of wearable technology has exploded to become a multi-billion dollar industry. We know more about our own health and fitness behaviour than ever before. Even as basic fitness trackers proliferate, both start-up companies and established brands are moving the needle beyond the mere gathering of fitness statistics to provide wearers with information that can improve safety and performance – from yoga pants that assist with alignment to a system that analyses which golf club will give you the best results at the tee to free weights that help lifters preserve good form.