When we have a bike and then a run we call that a "Brick work out"

it's not easy ......it's tough the only word I can come up with to describe

it is "Bio-mechanical dysfunction" LOL Because it's takes

a while for your legs to realize they are being used in a different

motion. ;D After 20mi on the bike then you get off to run 10k

it's like wow.....i need at least 1/2mi to 1mi to get it going.

Thats great your cross training though will keep you from getting

injured! Keep up the training......the human body thrives on physical

and mental challenge! Models for the brain and miles for the body!! LOL