So I've been lurking for a day or two, doing a few hours of research on (in before rage) actual self-inflation. I've done it twice so far; the first with just air swallowing plus a little water to prevent burping. That went very well, highly enjoyable, etc.
The second time, which was a few hours ago, I attempted a bike pump in the anus in the shower. I thought it wasn't working very well because I couldn't really get the nozzle in all the way, just the needle-ish part (didn't hurt when it went in), but it actually did. Due to the awkward angling and short length of the tube, I decided to stop using the pump and did the air swallowing again, at which point I found that the pump had worked well through a gas release ;).
Long story short, I finished, let the air flow out, and now my abdominal area is rather cramped. Is this normal, and if so, would stretching my abs beforehand and afterward be helpful?
Thanks for the help in advance.