Second, they track progress visually through charts, streaks, and personal records, which provides the feedback loop needed for habit formation. Third, the best apps adjust training based on your recovery data so you avoid the overtraining-burnout cycle that causes most people to quit. Fourth, they reduce friction by having your workout ready on your phone, meaning you can start training in seconds without planning. Break exercise into mini workouts While this level of involvement may not suit everyone’s needs, our tester said that this process was easy given the simple user interface. We also liked that it increased accountability, giving this category a 3.5 out of 5, as some apps…