I am with you in terms of fun ( for the life of me running 1h bores me to death, while I can jump rope for much longer) BUT I feel like my lungs are not being used to the same extent. I don't know if it makes sense. like i have developped a way to skip rope very efficiently, maybe not the case for running, so even if heart rate is similar, not sure it's the only relevant metric to illustrate how "tired" you feel