Thanks for all your replies. It has been five weeks and 10 to 20 classes later. Not really sure how many I kind of lost track. It has become so much easier my heart rate is well in hand. The problem was that my heart was not used to the intensity of the class. Now I have to push to get it above 90%, I have to spin really fast (were talking cadances above 150) or go really heavy at least 6 full turns. I have a high LT naturally about 193bpm. Climbing gets my heart rate up faster then the high cadance though. A cadance of 110 feels so slow now even on my road bike on its trainer. The rest of my team mates and I do two classes now back to back so it is like an hour and 45 min of spin class with two different instructors.

The one lady was right about the different styles on instructors. At my gym we have four ladies who lead classes. Which range from a half to a full hour. One lady is really big on high resistance and low cadance work, loves to do hovers and pulls. Another lady is really big into sprints and fast works with less resistance, but has a more balanced class, she rides road. Both of them lead parts of that long class I mentioned. The other two are a combination of both but a lot easier. I do the muscle tension class twice a week and the speedwork class every Saturday. My cadance has gone through the roof I hit 186 one time. It was really hard to push down to keep from bouncing. I had really sore pecs later that day.