Comparing the elliptical bike to running

Elliptical Biking vs. Running for Fitness

Advantages over Running

Low impact - the elliptical bike is much less damaging to the body
Quicker recovery - can do longer training and more intense training with fewer days off
More exhilarating - the speed and high-performance experience of elliptical biking can be more thrilling

Similarities to Running

Closest substitute for the outdoor running experience
Efficient and effective cardiovascular workout
Can achieve the "runner's high"
Can wear running clothes and shoes
Weight-bearing exercise
Conditions similar muscle groups

Disadvantages Compared to Running

Need equipment (bike, helmet) - can't just throw on a pair of shoes and go
Running provides a slightly more efficient workout
Usually have to deal with more traffic/car issues
Requires balance and skill
Currently elliptical biking is limited to the road
Potential to have a workout interrupted by a flat tire or mechanical problem

Compare elliptical biking to cycling

Compare elliptical biking to the elliptical trainer