One of the most important functions of movement would be the ability to get up easily from the ground up.
Subsequently once we master to move our own weight we can move on to moving or lifting weight to strengthen and progress ourselves.
The Posterior Chain refers to the structures at the back of the leg and spine. The main muscles that make up the Posterior Chain are the calf muscles, hamstrings, gluteus maximi, latissimus dorsi and the erector spinae muscles.
A strong posterior chain contributes to a strong core musculature, which reduces back pain and low-back injury, while also facilitating coordination and strength through the limbs. The muscles in the posterior chain play a huge role in everyday activities, such as picking something up off the ground, sitting down and standing back up, or jumping.