started interval training.

My swim buddy has started me doing interval training. I have become frustrated at not increasing my endurance. He said that neither did he until he started interval training. I'm starting with 1 min down, 1 min back, rest/breathe..repeat. I did that "NEARLY" 3 times today and it really shot me. My form is good now,it's just got to do with endurance and for the first time today I noticed my arms getting sore like when I lift weights or workout so I"m pulling and grabbing more water. I'm really trying very hard and have only been doing this swim gig for 2 months. I've come from barely puttering in the water to swimming a length in 36 seconds so I guess i'm doing good. I know this: I swam harder today than ever and pushed myself really hard to the point of, gulp,nausea, but I did it and I look forward to doin it again. I've even bought myself a waterproof watch to time myself. I used his today. I work better with specific goals and this will help me, I do believe. Until now, I was just swimming down and back until exhausted. I wasn't measuring any progress. Mark