I like to do HIIT sessions that also build muscle. Flipping a tire, pulling a sled, box jumps. When I am sore I do burpees and jump rope switching between them every-other round. I never go over 20 minutes. The rest and work times change based on what I am doing. I can jump rope forever but I cant flip a tire full out for more than 30 seconds.
I would like to try battle ropes as well. I think it would be a big challenge on upper body for me. Those ropes can be pretty heavy.