Strained 2 muscles so far. Lower back and abdominal. The lower back one hurt more but easier to lift around as long as I avoided certain excercises. Abdominal had me out the gym for 2 weeks. Can't do any excercise really that doesn't contract your abominals.
Make sure to ice it the first 48 hours then apply heat after. Make sure to start stretching it after the first 3 days from injury. If it's a area where you can massage do so couple times a day softly. And try to avoid all movements that add any additional strain. And you will be back to gain season relatively quick.