3 top british fell champions used to do 80% of there running on roads,
also quite a bit of speed work on treadmills,and they lived in the middle of some brilliant countryside.
but ask them what they prefered and they would say fells everytime.
its like anything else,you get what you put in,
these guys knew to beat the best they had to train harder than the best.
anyway sorry to digress,
lunaglides for me.