[BCGolf]

I always thought of Endless Belt to be like the conveyor belt that delivers luggage at an airport. When the bags are moving on the straight line part they are going at a constant speed and easy to lift off. As soon as the bags reach the pulley portion of the belt they speed up and are difficult to catch, never mind lift off.
The bigger the pulley the slower the bags move. The smaller the pulley the faster the bags move.
At start down the hands are moving on the straight (linear) portion of the belt. Constant and steady pressure. When the reach the pulley part (radial) they are whipped around.
In the link it looks like Mike is using a big pulley.