Did I read correctly that you up to 20 minutes on the jacobs ladder?that's alot of time Maybe it's time to add a small day pack with 10 lbs?
I've been following a routine called Hyperfittness for years. My daughter found this book for me at a yard sale. It's based on a 12 week program, 12 weeks of trekker, 12 weeks of hiker and 12 weeks of sherpa routines which progressively get tougher. Mon,wed,fri is the same tue,thu the same then every 2 weeks it completely changes so your body and mind never has a chance to get used to the same workout. So what I've been doing is 2 wks of the trekker, 2 wks of the hiker then 2 wks of the sherpa there by peaking every 6 wks. These workouts strengthen the ligaments, tendons, heart alot one thing after another exercise.I don't care how much i can bench prees or squat or none that.