>>76584177
>having a strenuous training every day isn't really sustainable for a normal person
Get good sleep, hit your macros, and program active rest days instead of doing full body workouts and you'll be fine. During the aforementioned 60 hour work weeks I was on a push-pull-squat rotation six days a week with jogging/running seven days a week, so only hitting each muscle group twice in a week. For cardio I was running 10-20 minutes on lifting days depending on how I was feeling and 20-45 minutes on Sunday. I'd sometimes do some supplemental core, grip, etc. work on Sundays if it felt reasonable.
>I used to do 3 FBWs a week (legs were hit each time) and run 2-3 times a week and it was absolutely miserable
Doing a full body workout three times a week is a reasonable approach for a beginner but is generally not enough rest for an intermediate lifter. Try programming a split. This will allow you to train each muscle group more intensely while allowing for more rest in between training sessions for each muscle group. I personally like push-pull-squat.
>verging on being pointless from all the stress it was generating before each session
What's going on there? I always look forward to sessions no matter how busy I am. They're meditative.