It seem that you do NOT require surgery to fix a grade 1 muscle tear. As long as you’re willing to keep working out and be willing to go through a lot of times where you think “OHH SHIT DID I JUST RIP MY CHEST AGAIN?!?!” and instantly stop your whole workout Just incase. Deffinantly painfull, but it is not as bad as when the muscle its self was torn. Grade 1 muscle tear, working out could fix it(im actively doing this). Grade 2 muscle tear, 100% requires surgery (i hope to never experience this) .