I’m 51M. The last 6 months I’ve been doing lifting Sunday,Tuesday, Thursday and interval training Monday, Wednesday, and Friday. I also do 10K steps per day. Doing interval training as my VO2 Max is super low, and that’s my main goal right now is just to get my cardio level up to average. I get plenty of calories. Sleep is okay, about 6-7 hours per night. Anyway, just feel burnt out and need to change things up. I want to keep working on the cardio. I don’t want to lose my progress on the lifting side. I’m not trying to bulk or cut- just be reasonably fit. Any suggestions? Thanks!