HEART RATE MONITORS AND IPHONE APPS

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Hi.

I was thinking about getting a hrm. I began looking at the watch type but I would prefer something that tracks on my phone.

What are the best app/strap combinations please ?

I have a budget of £50 for the strap. Don't want to spend more than that.

Which app is the best ? Must be 4s and 5 compatible

Can two people use the same strap on different phones ?

Will it log calories burnt from the elliptical and home DVDs like p90x and jillian michaels ?

Thanks

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