For me, running is harder. Running up a hill will give me shin splints no matter how much stretching I've done beforehand. Depending on the grade, biking a hill can hurt, but I usually recover a lot faster than I do when I run.
Riding is much harder - I have to walk
Running is much harder - I have to walk
They are about the same
Riding is harder
Running is harder
other; explain
For me, running is harder. Running up a hill will give me shin splints no matter how much stretching I've done beforehand. Depending on the grade, biking a hill can hurt, but I usually recover a lot faster than I do when I run.