Like any professional athlete, Kobayashi trains hard to remain at the top. Like a baseball pitcher strengthens his arm, Kobayashi works to prepare his most vital body part: his stomach. The key is getting the stomach used to stretching to accommodate large amounts of food in short bursts. Kobayashi exercises several hours each day to shrink his stomach. Then he drinks gallons of water and eats lots of hard-to-digest foods like cabbage to stretch it out.
- On October 28, 2006, Kobayashi set a new world record during the 2006 Krystal Square Off in Chattanooga, TN, consuming 97 Krystal burgers in 8 minutes.
- Other world eating records held by Kobayashi include 17.7 pounds (8.0 kg) of cow brains in 15 minutes and 20 pounds (9 kg) of rice balls in 30 minutes.