What should a 75% effort on the bike feel like?
I've calculated my 75% effort as 131 beats per minute, but it is quite difficult to get that high, especially on the road, and really tough to stay there. I've held that heart rate on a trainer for about 10 minutes, but it's torture, not so much for my aerobic system, but for my legs. Does it sound to you like I've miscalculated the HR zone? Or do I just need tougher legs? :)
I'm new here, so I apologize if this has been covered somewhere. Thanks.