Here is a set of exercise dice that makes working out more fun. The SPRI 6-Sided Exercise Dice Sets includes push ups, lunges, squats, jumping jacks, crunches, and a wild card workout. A dice is available for rep counts and exercise duration. These soft foam dice measure 2.75″ x 2.75″ x 2.75″.
You can easily carry these in a mesh carrying bag. More information is available here.