Yessir, that is true. Contrary to what others have said, I have found that running compliments my cycling, and helps me get better at both. My weekly mileage averages about 120 on the bike (lots of rollers, a little bit of speed work) and 8 to 12 running (LSD and intervals). I mix it up depending on how I'm feeling and the weather. I tend to up my running mileage during the winter while slacking a little on the bike - bitter cold or inlement weather and darkness are the factors. I am thankful I can do both without significant injury so far. Mixing it up works for me. I'll never be great at either, I love doing both, and they each have had a positive impact upon my health and fitness.