@Charred - It’s interesting that you talk about tearing the muscles. The human muscle system is delicate indeed and can be damaged, in ways that are not good.
I suffered from tendonitis years ago and some shoulder bursitis because of poor ergonomic postures. I noticed that as a result, any weight lifting I did afterwards was especially painful and exacerbated muscle tremors that I would normally get from weight lifting.
Sometimes it didn’t even have to be heavy lifting. It could be something as simple as ten pound dumb bells. Anyway, you have to be careful with your posture and strength training so that you don’t throw your muscles out of whack.