Some people have a hard time believing it’s possible to get results like this. If you’re one of them this may help.
The reason these speed training exercises produce such great results at quickly conditioning your muscles to be fast and responsive is because during an isometric contraction with resistance bands, the muscles’ motor unit recruitment patterns are entirely new and different than what has been normally experienced by a muscle that has not been conditioned with this type of training.
When using the resistance band with an isometric strategy, each attempt by the muscle at balancing and stabilizing the dynamically changing force of the band helps to create and re-enforce new neuro-pathways inside the muscle. This process accelerates the development of strength, speed and coordination within the muscle.
This muscular development becomes even more pronounced the weaker the muscle gets as it attempts to hold the isometric position. This is because when the band can no longer be held steady due to a weakening muscle, quick and ongoing small changes in the resistance level of the band force the muscles to immediately react and alter their typical motor unit recruitment pattern without resting in order to stabilize the band. This kind of speed training exercise is of great benefit to the athlete.
You will get even greater value when these strategies are applied during an exercise to joints in different planes and angles from what they normally perform in the gym.