Lets see how these cardio killers compare?
Because cycling does not involve impact, it is easier on your joints and muscles. However, running demands more energy, and is more effective for burning calories. Cross training by running on some days and cycling on others can help balance out your muscles, and give your joints a break.
While both running and cycling provide a cardiovascular workout, the two sports use similar muscle groups. In cycling, the majority of power is produced by the quadriceps and hamstrings in the upper legs and the soleus and gastrocnemius in the calves. In running, the primary muscles used are the hamstrings, quadriceps, glutes, iliopsoas and calves. Neither running nor cycling tend to build overall muscle mass; in actuality, these sports can causes muscle fibers to shrink because the body aims to make muscle fibers more metabolically efficient.
Cycling gives you a good workout without the impact of a run. If you’re not comfortable with replacing an entire run workout with a session on the bike, even substituting a portion of your run with a cycling workout can make your joints happy.
Cycling is going to give you more of a full body work out. Because biking involves balancing your body’s weight on a two-wheeler, with your body in a tripod position between pedals, seat and handlebars, your core muscles are continuously involved while biking.
So if I had to pick which cardiovascular workout is the winner; biking or running, I would have to answer biking. Biking will also improve your gait and make running feel like you are flying if you alternate to biking for a significant length of time. Something about building up the different cycling muscles boosts your stride and makes it feel like you are running on air to start.
Biking is better for your joints, tones way more muscles and is low impact with the same feeling that you get after a long run without the ache and damage