Workout Trainer by Skimble App March 31, 2013March 31, 2013kaylarenzLeave a comment Workout Trainer by Skimble Great app for circuit and cross-fit training on-the-go or in the gym. Uses iOS or Android operating systems and can be accessed from a PC or Mac. Paid (Pro+) version is available, but there are 1000’s of high intensity workouts for free. Enjoy!