HIIT if you are a woman, stronglifts/Rippetoe strength training if you are a man. On lifting, you don't need a gym. You need a powercage, a bar, and some plates. You never need crossfit. You want muscle confusion? Lift 5 pounds heavier than last week. Now your muscles are confused.
For cardio, ruck. It's your body performing natural movements (walking) and done in a way that is useful (adapting to carrying weight.) There is a reason that the military still does long ruck hikes for PT.
Ruck hikes helped destroy my knees. but honestly, we had good times even with the pain in the ass it was.
I dont think they would be enjoyable alone.
"Enjoyable" is the difference between exercise and training. If it's just enjoyable exercise, do whatever you enjoy.
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