I do kickboxing and we tend to do planks and push ups during warm ups. I can't hold my planks as long as we are supposed to not because I am unable, but because my feet start to slide out from under me. I can hold them fine home on a carpet or a yoga mat, but the KB mats are different from yoga mats.
I was looking for either a grippy sock or a band that goes over the ball of my foot that will help me hold in position with out my feet sliding out from under me. I tried yoga socks, but they didn't really work, they are for a textured yoga mat. Plus I have not found ones with enough grip in the areas I need - top of the ball of my foot and on my toes.
What have you found to work?