The Basic Tornado100 includes circular, non-slip foot platforms. Once purchased, you will have free access to the Video Library for the first three months.
Thereafter, the subscription will be 9.97 per month (based on annual subscription).
It is best to use the Tornado with runners, never ordinary socks (holes will appear from the grip on the non-slip surface).
Grip socks will be OK but also run the risk of ordinary socks. Bare feet is fine.