In the article about "Stretching' the important thing to remember is to Stretch AFTER your muscles have been thoroughly warmed up.
I cringe when I see someone come into the gym and begin to stretch.
Who told them to do this???
I liken stretching a cold muscle to placing a chewed piece of chewing gum into the freezer for a hour, then taking it out and immediately trying to stretch it!
Damage to the "Connective Tissue" will result.
But most people that entertain training in a gym have NO idea what connective tissue is or how to introduce themselves to rigorous training!
Most Gyms OFFER a training "Package" but the prices are ridiculous. But all gyms make everyone sign a Waiver, in case of accidental injury. But is is an accident when these Hired Pros know full well you are new to this??