Working as a personal trainer, one of the things that I have come to realise is that faulty movement patterns are common.
I would say that about 80% of my personal training clients start out with faulty movement patterns.
One of the most common issues is an inability to hinge at the hip with a good posture. The knees typically travel forward and the upper back rounds over.
This faulty movement pattern is a major issue when it comes to basic and fundamental exercises such as squats and deadlifts.
Reduce Risk of Injury
This is in my opinion just one reason why so many people injure themselves at the gym. As soon as you add load to a faulty movement pattern (with weights) it magnifies the problem and can lead to injury.
The only way to avoid injury is to correct the faulty movement pattern and address imbalances.
Get Some Help
My advice would be to find a skilled trainer and work one to one to ensure that you have good bio mechanics. That way you can train with confidence and reduce your risk of injury.
Technique is everything.
James 'technique' Gorman