What to put on bottom of tennis shoes to stop slipping on wood floor?

[Jo-Dawg]

I have done the Insanity workout form beachbody and am going to start p90x tomorrow. All thorughout Insanity I had the problem of slipping when running in the plank position and exercises like that. Is there anything I can but on the bottom of my shoes to stop me from slipping on the hard wood floor. There is no carpet in my house so I can't just workout on the carpet. The slipping mostly occurs when I am on putting stress on the souls of my shoes. Any help would be much appreciated. Also I got new tennis shoes and the problem still existed. Thankyou