ohhhhh dude you pulled an ab? i did the same thing my second week of training! i was so excited to climb this thing (ok it was a vending machine) that i leapt straight onto it without doing any stretches first, and i'd already trained heavily the day before. I got a minor tear in my lower ab and was huddled in pain :[ thankfully my friend and i went back to his house right away so i could ice it, and i just kept icing it, and it healed rather quickly.
remember, RICE! (rest, ice, compression, elevation). get well soon :)
so uhh... i'd say take it easy for a while.
from about.com: (if this is indeed what happened).
stupid lazy vaults ;)
What is the treatment for a pulled abdominal muscle?
Treatment of abdominal muscle injuries is difficult--there is no way to splint the abdomen and it is nearly impossible to fully rest these muscles. That said, the most important step after sustaining an abdominal muscle strain is to allow the muscle to cool down and allow the inflammation to subside. Avoiding exercise to allow the injured muscle to heal is important. Activities that cause pain or spasm of the abdominal muscles should be avoided.
Gentle stretching is helpful, but it should not be painful. Stretching excessively can be harmful, and slow the healing process. Apply ice to the injured area in the acute phase (first 48 hours after injury), and then after activities. Before activities, gentle heating can help to loosen the muscle.