Injuries usually occur from straining , over training etc. so when you get a serious injury you need to take what you can learn . Hopefully you seen a sports medicine orthopedic who will have relevant advice and therapy . Rest and ice alwAys immediately - pt can do electronically infused corticosteroids into the individual muscle group which will speed recovery . Over past 40 years I've ripped and torn pretty much every muscle At least twice lol, sports, lifting , 12 hour daily martial art and combat training , I fought in desert storm and continue to teach combat to soldiers too. It's mostly not true when given a specific lift or grip causes injury as it's technically that people lift too heavy for that - like press behind neck is weak position save the ultra Max lifting for conventional presses. Don't lift Max heavy every workout you need to cycle your workouts like every thing else . Higher reps have a place in everyone's trainng for that reason. Usually in PT the same movement that injured is the same one that will rehab the muscle just lighter and much less intensity at first , then always warm the body temp prior to working out. Start your muscle group light then pyramid just the beginning no need to pyramid every set of exercises. I also advice if you can train around the injured part then do so, no need to lose progress everywhere . I consider machines are for that purpose - 2 days after lower spine surgery I continued to train my whole body - I just utilized nautilus and cybex machines to train around - no move that would compress my spine - I still squatted even - a decline squat a decline over head press machine - I actually got a temporary gym membership elsewhere to train. Be creative . All my MRIs indicated that at 35 I healed faster than normal - my doc figured my training and diet was responsible . To this day I continue to deadlft squat press heavy , train ma 2-6 hours on top of a 40 hour job at 48 no belt - my body serves as support through strghthening support muscles - you can do this with every body part. Of course if you compete I'd recommend a belt and compression wear . The gym can injure but it can be the fountain of youth as well.