This is what I've found after 15 years of working out and athletics. Think of it this way: doing the same thing over and over again is what is proven to lead to workplace injuries. Doing the same thing over and over again in the gym is no different.

I like to do a weight training as the consistent foundation, with a mix of heavy lifts, calisthenics, volume (bodybuilding) training and mobility training. Add in some yoga, rock climbing, biking, soccer. I feel this sort of mix balances movements out which helps with injury prevention and also makes sure you always have something active to do that you enjoy, which is definitely #1.