Tweetour body wants to work with the greatest number of muscles possible. It is more efficient and effective this way. The complex movements that our muscles create are achieved through the contraction of multiple muscles at one time. Some are more dominant than others with certain movements while others serve as joint stabilizers or accessory muscles. utilizing complex (multi-joint) movements is more effective and functional for sports demands as well as every day life and activities.

Isolation exercises are meant to train the body to use only one specific muscle group. While there is a time and a place for isolation exercises, building a training routine around isolation creates a body that works in a very non-functional way. In other words, in a way that is not natural. This can lead to both acute injury and overuse injuries because the muscles are not working together to create a movement. Instead, you have a bunch of individual muscles that, instead of a powerful, functional movement, create a jerky motion that doesn't work well.

I have seen many people over the years suffer an injury that was created because of an isolation exercise. A significantly fewer number of injuries, if any, are caused by doing complex movements. Complex movements also create a more lean, muscular, and functional body that is better able to generate power and strength by working together to produce force.

If you look at any sport that requires strength, speed, power and agility you will notice that it requires complex movement patterns. Take a football or soccer player for example. They don't train with isolation exercises. They are performing too many complex movements to waste their time doing bicep curls or leg extensions - neither of which will effectively make them more prepared for their sport.