Here is a link to the DC Rainmaker Apple Watch Review (Fitness Aspects Only). If you are really interested in how the Apple Watch works in the fitness area - heart rate monitoring, running, cycling, etc. then this is the review for you.
http://www.dcrainmaker.com/2016/02/apple-watch-review.html
http://www.dcrainmaker.com/2016/02/apple-watch-review.html