hey. i'am starting my base training, the only way i can keep a steady pace is using a 10km low gradient hill, because terrain here is just up an down, is it ok to do repeats like 30 mins going up at zoneand 15 mins going down? like 3 ou 4, how much worse is it than doing 1.5 hour steady? will i be able to build a solid engine doing this?
it's really the only way i can to base training..