The Shreddy app has an in-built weight tracker, but not the kind you're thinking of. Instead of tracking your personal weight, this section of the app is designed to track every rep, set, and the weights you used while doing them. This is one of the features we find most exciting, because the weight tracker is built into the workouts. If the suggested weight is too heavy or too light — or the number of reps is too high or low — then you can easily change it up and record the weight you used, making it easier for you to track actual progress.