I put mime on the end of the bench is this wrong? I don't arch my back or anything but I just feel more confortable when I put my knees up and my feet on the end of the bench.
Most recomendations regarding putting your feet anywhere other than the floor is designed to limit you from arching your back.
I don't have an arching problem so my feet are on the floor.
I don't know any issues with having your feet anywhere in particular other than the arching issue to get your legs/back out of the lift..
I've always believed it's best to firmly plant your feet on the ground about shoulder width apart and then even push your feet down to tap into as much power for the movement as possible.