I used to do an hour of power lifting in the morning, then after work, two hours of BJJ/Kickboxing/conditioning five days a week.

I didn't start doing that, I built up to it over twelve hard months with heavy focus on base fitness and flexibility.

Needed a complete change in diet and mentality to do so. My diet was totally focused on training for the longest time, stupid mix/maxing such as eating lentils over rice due to lower sugar content and higher protein content.

It was also a massive help that I WfH and have a weights cage at home so that saved an enormous amount of time that I could reinvest in training.

I cannot train that hard now as I am too old to recover from that much training but I did so for more than a decade. Now I just focus on lifting every other day with stretching/yoga in between.