If you think the two are anywhere near each other in terms of instantaneous effectiveness, you must be tripping. Exercise can take months to possibly help. A single good trip can fix years of depression, months forward.
Olympic weightlifting is actually one of the safest sports. But most people who lift are doing body building or more sport-specific training, which is where you see most of the injuries.
Meanwhile, I commute by motorcycle exclusively five days a week and have never missed work due to or come to work with an injury. The safeness of any given activity is relative to each individual and their training.
They're actually required to be amateurs, but otherwise yeah. :-)
Your typical gym-goer does all kinds of other stuff though, like crossfit and similar nonsense, which is highly injury prone.
The "classic" (i.e. Olympic) exercises, is a very safe sport.