> and it's replaced both a gym and a trainer for me In that case, the gym and trainer were not actually necessary in the first place. Below a specific level of

> and it's replaced both a gym and a trainer for me In that case, the gym and trainer were not actually necessary in the first place. Below a specific level of fitness, it doesn't matter what exercise you do. There are safer and more efficient forms, but all that really matters is that you do it and you don't hurt yourself in the process. Those trainers, and gyms, were serving an artificial market that didn't actually need them (like some restaurant waiters, bank tellers, travel agents, etc). Perhaps a better analysis of the whole situation is a collapse of existing artificial markets that businesses have used to expand beyond their current market.