An example from one of "those who've shifted from established careers to something entirely different"

I used to be a software developer, now I cut up meat at an abattoir (combination choice/circumstance.) In one sense, I traded "work at a desk, go to the gym in my spare time" with "workout for work, sit at a desk in my spare time."

Upsides? Fitness, don't take your work home, redundancy less likely. Downsides? Less pay. Samesides? RSI in both jobs.

Doing the same thing every day is relative.