Interestingly, I seem to be one of the few people the AirPods don't work for when it comes to exercising - they don't fit well in my ears, so they'd fall out if I tried to exercise in them :( .
Love them in general though, they are good enough for the price & what they do.
The audio quality is also massively improved because of the better fit. The downside is you have to take the skins off before putting the AirPods back in the case. I also bought one of these pouches to keep the AirPod case and EarSkinz in. Works well, all in all
If you get the old foam slip-on covers that used to come with all Apple headphones, they might stay in your ears a little better, and you can close the case over them.
Love them in general though, they are good enough for the price & what they do.