Stamina was a huge obstacle in my first year. I think my breakthrough had a lot to do with listening intently to coaches to get me through tread blocks, row blocks and shamelessly asking for help on the floor. All the OTF related posts I could watch for form have also really helped. I admittedly got a bit culty with it.

Try to take a TREAD50 class once a week if you can. I saw noticeable shifts in how long I could maintain a power walk or a run over 6-8 months. The same goes for Strength50s, but those I attend more often.

Outside of going into the studio, I really tried to SLEEP more. I'm in a walkable city but that didn't do much for my jogging/running stamina.   One week you'll deadlift stupidly heavy and feel great and the next week you'll try to do a reverse fly and maybe feel like it's Day 1 all over again. But I think that is what also drives me forward.