Health & Fitness Technology

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Hi guys

I am currently in a position to build a range of health and fitness technology products for a leading department store in Australia.

I have a good idea about what to include (after much research and many meetings with suppliers), however I thought I would throw it out to you guys - what would you want to see and/or expect to see in a health & fitness technology range?

eg - think heart rate monitors, appcessories, headphones etc

Thoughts?