The Bracketing technique

Application of this technique:

Performs the sports movement with lighter-than-normal and/or heavier-than-normal implements.

Example using a shot-putter: 

1) Trains with an extra heavy shot

- Develops greater-than-normal forces during the accelerative movement

2) Trains with a lighter shot

- Develops more speed and acceleration

With these 2 types of training combined, he is able to optimize his throwing power (force and velocity) when he uses back the competition shot.

You can often see this technique being used in powerlifting and olympic weightlifting.