First Core Interval

Did my first core interval. It was much easier for me hold this pace than the push pace which is weird because the core interval is at a higher intensity. Made a mistake and gulped this Hammer Nutrition stuff between intervals. It ended up giving me a stomach cramp and forced me off the bike. Here are the comments I sent to my coach.

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Here is my summary from last week. Sorry I took so long to get it to you.

The workout tonight didn't go so well. It started off pretty good. I
bumped my EM heart rate up to 135-140. I didn't hold 140 the whole
workout but it was better then it had been. I also did the 3 x 2 core
interval warmups. I found a gear where I could hold 90 RPMs and still
get my heart rate up. After a couple core warmup intervals I noticed
it was much easier to spin in my EM gear. I was able to hold 95 to
100 RPMs where before the core warmups I was probably only pedaling 75
- 80 RPMs. Also the false walls went away.

Then I did my first 8 minute core interval. I was able to get my
heart rate up in a couple minutes and I was holding around 95 RPMs.
My heart rate was staying around 163-165. I felt good the whole
interval. It was much easier for me to hold this pace than the push
pace. The push pace always feels like I am bouncing in and out of
working hard. This pace I was able to just dive in and relax. It
felt normal and familiar. After my interval was over I sat up and
pedaled with my arms off the bars. After a minute or so my stomach
cramped. It was really high up almost in my chest. I couldn't take a
deep breath or bend over and hold my bars. I kept slow pedaling for 5
minutes hoping it would go away but it didn't. So I got off and layed
on the ground for 10 minutes until I felt better. Then I got back on
warmed back up and did my last two intervals. My RPMs dived with each
interval. It went from 90-95 to 80-85 to 70-75 RPMs. I was able to
keep my heart rate up for all three intervals. It wasn't overly
painful. I felt like I had plenty left but I could tell from the RPMs
dipping that I wasn't as fresh as my first interval.