I have been using Nike+ Kinect Training for over 4 months now and it has helped me build endurance and muscle, burn calories and get me in better shape. The program constantly measures you to let you know how you're doing, and does an assessment at the beginning of each 4-week program to assess your progress overall. The assessment is called a "fuel-print" and gives you a measure or your athleticism and your fitness level, and uses those measures to compare you to others in your age group as well as the trainers. Your fuel-print will (hopefully) improve with each 4 week assessment.Based on my needs, I have 3 sessions a week: 2 cardio and 1 strength. I'll usually add in an extra session a week for weight training (some exercises use 2 dumb bells), and have also added on the upper body+core and lower body+ core add on packs (can be purchsed with 400 Xbox points each). I try to get in about 5 sessions a week total, the add-ons are usually 15-30 minutes each, and the regular trainings sessions I am currently at 45 minutes/session for cardio and about 30 minutes for strength.The Nike+ web site also does a good job of tracking your achievements and history.I like that the program pushes improvements incrementally and tailors your workouts to your progress. When I started, the program was set for 6-7 20-30 second exercises (e.g., high-knees run in place) and after 4 months I'm now up to 60 second exercises with about 12 exercises done in 2 sessions (with a 2 minute "rest" period in.