Ab Trainer with MatAb Trainer with Mat: comfortable, effective abdominal muscle training Training the core and abdominal muscles is part of any fitness programme. Exercises with the Ab Roller with training mat are a comfortable and effective alternative to conventional crunches and sit ups. The Ab Roller: A Functional, Stylish, and Compact Ab Trainer Classic sit ups and crunches are well known exercises, but beginners often struggle to perform them correctly, which can