How to Get Faster with "Intensive" and "Extensive" Cycling Workouts

[@barrydunne78]

I have question about about v02 doing 5 x 4 at around 118% if my zones are correct. When I check how much time in zone I get above 90% hr it's about 10mins, do I need to try squeeze out the interval to 5mins to really get the most time in zone above 90%