You are improving… right?
Often times it´s hard to tell. Especially in Functional Training it becomes very complex as there are many factors involved. Even if you use standard fitness trackers you don´t really get the juicy performance data. They are mostly guessing how you are performing during your workout.
Fitness trackers can roughly assume your calorie consumption and sometimes even count the repetitions as well as let you log your workout. But the most important factor is the actual resistance that you worked against and exactly how you did it.
Time under tension, weight velocity, peak resistance: powrlink Sensor records it all and gives you the complete data of each and every training session.