1st group run EVER = Intervals

Training lasted an hour & it was my 1st group run EVER. It was cool, I met some really nice folks. BUT...leave it to me to somehow wind up w/ the wrong training group (which wound up being a great workout & I learned some stuff & luckily they were really nice to me and didn't send me packing). So we run down to this greenway where we gather & the Coach tells us to do a warm-up thingy where I had to count 20 steps running my shell off, then 20 more at pace then break for 40s and do it all over again. I'm thinking "I wonder where the rest of the group is. Why are there only 4 of us". But I'm new & apparently clueless so I'll just do what the Coach says. I survived that 1/2 mile "warm-up" w/ no problems. I get back to the start point & the next thing I know we're running a mile of INTERVALS. I hadn't a clue what an interval was or the point of such, so again, I just did what Coach said. After completing the first interval he asked me "hi, ummm, who are you", I said "I'm Turtle". He informed me every so kindly that I was with the wrong group but that it was okay and did I wanna run some more intervals? I stuck w/ the group & ran all three intervals. Good workout. My times were 3:50, 3:44 & 4:01. And I have no clue what this means other than if I add them up it makes my time for running a mile look pretty good @ 10.95.  HAAAAAAHAAAAAHAAAAAA!!!