The Nothing Ear (stick) are great for sports and fitness. Their one-size-fits-all design means that their fit highly depends on your ear's shape. However, they won't move around too much during a run if you can get a good fit. They can fall out if you do much more rigorous activities like push-ups. On the upside, they're well-built, very comfortable, and are certified IP54 for resistance against water splashes.