Ab classes have kinked my pump canula too. The only solution I've found is to only do ab workouts when my site is in lower back or legs.
My MiniMed rarely gives a "No Delivery" alarm when canula is bent and insulin isn't being delivered. The alarm usually just goes off then there's a pump motor problem that inhibits insulin delivery.
Good to know I'm not the only one. My pump never alarms either-- even if my bg is rising and rising up into the 300s or 400s... I just have to use my own intuition and change the site.
Thanks for replying everyone! I'm just avoiding abs for now. I like the Quicksets because of the hidden-needle insertion (I'm terrified of needles) so the Silhouette isn't really appealing to me. I've tried my sites in my butt (which works pretty well) and legs (with lesser success) and a couple times on my hips with about 50% success. So I guess sticking with my stomach > abs exercises for now.