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I'm going to go a different advice route then other commenters here. If you went to the gym and did a really easy workout that was comfortable.. that would be a bad gym session. The goal is to push yourself. Not to injure yourself but to go until failure. We don't learn in the comfort zone. We learn and grow by pushing ourselves where we feel like we might fail and then pushing until we fail. Success isn't a game of…
There comes a point in your life where this may not still be true. At 70 I doubt I'll be pushing "to failure" in training sessions. In fact, I'll probably consciously reduce the intensity of my training sessions and use them to maintain muscle mass for as long as possible into old(er) age. The same goes for work. I'm a hard worker, but I'm not gonna bust my balls at some startup so the CEO and his buddies can make a…
You should, as a person, work to grow and be stronger no matter your age, whether that's squatting 400lbs or doing your water aerobics. Work the correct weight for you.
You should not bust your balls at some startup so someone else can get rich. That isn't helpful. Don't do that, regardless your age.