Got a picture? I'm thinking you might be referring to a fist drill or something similar. The goal there is to work on your "feel". You want to feel your forearm doing much of the propulsive work. You can also swim with tennis balls in each hand or close one or more fingers (again, reducing the effectiveness of your hand as a paddle). Maybe knuckle paddles are some device for facilitating a fist drill while at the same time separating you from a little bit of your money?
Got a picture? I'm thinking you might be referring to a fist drill or something similar. The goal there is to work on your "feel". You want to feel your forearm doing much of the propulsive work. You can also swim with tennis balls in each hand or close one or more fingers (again, reducing the effectiveness of your hand as a paddle). Maybe knuckle paddles are some device for facilitating a fist drill while at the same time separating you from a little bit of your money?
