An exercise apparatus comprises a frame having a base and an apex. A least
one pivot is connected to the frame for supporting a swinging arm. The
opposite end of the arm supports a seat for an exercising athlete, and
optional weights. The frame supports a force plate opposed to the seat.
The seat and the force plate are connected by elastic members, such as
bands, that bias the seat toward the force plate. The athlete develops
reversal strength by extending his legs to bound from the force plate,
then stopping the resulting forward motion at a predetermined joint
position before rebounding again.