Buying health and fitness products can feel surprisingly personal. A yoga mat is not just a yoga mat when it decides whether your knees feel supported during a morning stretch. A pair of running shoes is not just footwear when it changes how your feet feel after three miles. Even a simple water bottle can become either a daily companion or another item forgotten at the back of a cabinet. The challenge is that the health and fitness category is full of products that look similar at first glance. Many promise comfort, performance, motivation, recovery, or convenience. Some are genuinely useful. Others are nice to have, but not essential. The…