Flexing your muscles is not always a simple one step process, just think about yourself or someone learning to ride a bicycle for the first time without a solid mind muscle connection between your legs pedaling and your arms steering.
Clear your mental state and arrive at the mind muscle connection for proper muscle pattern
It is time to meet that muscle and get to know just how it moves and when your muscle is telling you it is had enough. The connectivity of mind muscle connection is set up better and better over thousands of repetitions and years of growth.
Get to know each of the muscles that move you and begin to understand their elasticity or flexibility in proper range of motion. Feel your muscles to determine the size of one versus another for balance of muscle tone.
Watch on YouTube – https://www.youtube.com/watch?v=egnsf7BuE80