Many people lack a proper programmed warm up routine, and may even lack any such thing as a warm up routine at all. A common mistake people make is engaging in static stretching prior to weightlifting. This is not the best of choices, especially prior to heavy lifting/resistance training. 

Here is why:

Static stretching promotes a calming effect on the nervous system. Why would we want to be calm prior to a high intensity resistance training session? Not favorable to the expected intensity of the workout!!!

Holding static stretches can lead to a reduction in muscular strength. Temporarily, decreases in muscle strength & power will be noticed. This will impair performance.

Why would you want to decrease the muscle activation in the muscles that you plan on using?  We do not want a poor performance!

Static stretching prior to lifting can also lead to increased muscular fatigue/strain. During high intensity movement, this WILL increase your risk of injury.

Why dynamic/active stretching instead?

This form of stretching is extremely effective when specifically programmed to the training you have planned for the day (sport or movement specific). Increases in blood flow allow for better circulation distribution & elevated heart rate (HR) prior to intense training. This is an essential preparatory phase.

The enhancement of flexibility!!! Increases in ROM in targeted musculature, joints, and preparation of the surrounding musculature and tissue. Reduce your risk of injury with proper muscle/joint lubrication! 

Increased muscle activation prior to engaging in high intensity exercise. Wake up the body with advanced neuromuscular coordination that is specific to the movement of the workouts that are about to be performed. Essentially, leading to better body awareness and muscular engagement to the target areas. 

Don’t skip a proper warm up. Your body will thank you down the road! Longevity.