Hi, I've had my j pouch since 2003, and I'm a very active person. I love to workout and play sports. I've played softball, volleyball, taken a kickboxing class, I rum and have done strength training (low weight) since I'm a female and mostly wanna tone. I have and do the plank regularly have taken strength/toning classes. The largest thing I've noticed is when ever I start a new routine until my body adjust I do have stomach pain and frequent the restroom. Once I adjust then I get back to normal. The main thing is just take each new routine slow and pay attention to your body and always rest a day in between. This helps with muscle recovery and fatigue. Hope his helps