I may just have had it. I finally worked through my lower back issues and have been doing my training program - having fun, getting stronger, have been pain-free and started increasing my core exercises by doing lots of plank variations. Then costochronditis?! What even is that? I’m self diagnosing as this is the only thing that makes sense based on my symptoms - it feels like someone heated a knife tip and is sticking it in a lower left rib under my left breast. I’ve researched exercises and stretches but do not want to stop my upper body work. Anyone - whether with this or anything else - found that working through pain actually helped? Or any mind over matter tips? I sooooo do not want to stop my workouts - it’s the only thing keeping me sane, but I also don’t want to be stupid.