This x a lot.Burpees? Seems like that would be harder on the knees.
The house would need to be on fire.What exactly do YOU consider hard on the knees?
It's a lot harder to get a serious cardio workout without using the legs and no equipment.
Try a rower, you can a pretty intense cardio session on something like a Concept 2.
I don't know how anyone can stand to use an elliptical.
Burpees? Seems like that would be harder on the knees.
This x a lot.
The house would need to be on fire.
elliptical and recently re-enjoying the bike.
Love biking and glad to be back on it. It's a higher RPM and less pedal pushing but I'll take it.Stick with a bike, elliptical is too efficient usually to be the best bang for buck.
Unless biking hurts your knees.
In the end, any exercise is better than none.
HIIT is usually outside people with physical problems to deal with.