Running and biking are two of the most popular ways to get some healthy physical activity in your day. But whether you should be running or cycling is a surprisingly complicated question to answer, and there are some important considerations to keep in mind experts say.

Both of these activities are "excellent forms of cardiovascular training, and they also can be great for conditioning some of your muscles," Dr. Jeffrey Fleming, a primary care sports medicine physician at the University of Pittsburgh Medical Center, tells TODAY.com.

But there are also some obvious differences between these two activities, which might make one better for you than the other.

For most of us, running feels subjectively harder than riding a bike, Fleming says. "You're moving your bodyweight whenever you're

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