Originally Posted by jordanaustino .
Having run cross country in high school, I found that running helped me to increase my steady state power. That was with an increase in total training load and decrease in cycling. I also find that from a muscular stand point I lean out when I run.
There has been some research which has suggested that running increases V02max more than cycling as well.
I wouldn't cut out much cycling volume to run, but when daylight hours are limited running has a benefit of being pretty easy to do when it is dark outside. Up to 10 mile runs are a part of my off season plans.