Best tampon brand for sports?

I started using tampons recently and they always end up leaking an hour after I put one in. It probably doesn't help that I'm using light flow when I obviously have regular/heavy. But what tampons are best for very active people and have the least chance of leakage. I use Tampax currently and I don't feel like it's reliable for sports? And since I never really paid attention to how heavy my flow is until now what can I do to prevent leakage? Just go up to a regular size, because I'm not sure I need to use heavy?