Originally Posted by Servo888

Here's what's been bugging me. I've been riding for a while without a heart rate monitor, just doing my normal routines, which is averaging 17MPH (hilly roads), doing 30 miles. I'm 215lbs, so that's pretty fast for me. At any rate, I joined a new gym, and started taking spinning classes. At one of the classes, the instructor yells at us to reach certain heart rate zones; basically, 5 zones, from easy to hard. From the giant chart posted on the room, zone 3 for a 22 year old (moi) should be around 170BPM, but reaching that, and sustaining it for more than a minute is REALLY hard. The lactic acid build up to pretty darn severe. But the rest of the class is barely struggling! What the hell! Every class I end up sweaty, and beat up. Do I just suck that much?...