Apple reveals the secret fitness lab it has been using for TWO YEARS to develop its health tracking watch

Apple have revealed that they have been using people to test out the product that they were going to be releasing to the public. They have been found that they have had people testing their health and using the new apple watch that will be released soon to the public in England. They have been using these people for 2 years just testing it out to see whether it works good and was accurate with peoples health. 

• Lab has been running in this unmarked building for two years 
• Apple employees wear special masks and equipment to monitor breathing
• Were not told what they were testing - and used covered Apple Watches 
• Fitness app was installed by Apple as part of this week's iOS 8.2 update 

I believe that there is nothing wrong with testing out products as long as the peoples who they have chosen to do it agrees to the terms and conditions. They must also be treated fairly and not overworked. 
http://www.dailymail.co.uk/sciencetech/article-3004701/Apple-reveals-secret-fitness-lab-using-TWO-YEARS-develop-movement-tracking-watch.html