NOVELTY - The method involves receiving first performance data relating to exercise performed at a first parameter. A first performance profile is generated based on the first performance data. Second performance data relating to exercise performed at a second parameter is received. A second performance profile is generated based on the second performance data. The first performance profile is compared with the second performance profile. Feedback is generated based on a comparison result.    USE - Method for assessing physical performance of athletes such as racket sports players e.g. tennis, squash, badminton and table tennis players, golfers, baseball players, lacrosse players, field hockey players, ice hockey players and cricket players, and persons undergoing physical therapy e.g. patients, during physical activities i.e. exercise such as wall ball exercise, front squat, overhead squat, shoulder press, push press, push jerk, deadlift, sumo deadlift high pull, clean and throw, performed through objects such as balls e.g. American footballs, soccer balls, rugby balls, basketballs, wiffle balls, tennis balls, baseballs and golf balls, medicine balls, weights, dumbbells, kettlebells and exercise machines (all claimed), projectile type devices e.g. badminton shuttlecocks or hockey pucks, and devices used to drive a projectile e.g. bat, club, racket and stick.    ADVANTAGE - The method enables utilizing a wrist attachment to analyze swing patterns and movements in racket sports players, golfers, baseball players, lacrosse players, field hockey players, ice hockey players, cricket players or in other sports where the athlete controls a swinging or stick-like object, and accurately determining angles of motion with an exercise system for potentially eliminating or reducing need for post-training video analyzes and eliminating error inherent in post-training video systems caused by parallax. The method enables utilizing the exercise system to allow continuous real-time monitoring of movements so as to prevent injury by warning the user straying from prescribed or optimal technique or volume of exercise. The method enables realizing transmission of data to allow coaches to track progress remotely and automatically, and allow managed care providers to ensure user compliance and spot trends in users behavior, thus achieving cost and time savings for parties by increasing interval between follow-on visits.    DETAILED DESCRIPTION - The first and second parameter are weights.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic block diagram of an exercise system.    Exercise modules (101)    Electronic network (103)    Interface devices (105)    Databases (108)    Data analyzer (110)