Does 7th Gen Nano need kit to properly track calories if you are on arc trainer, eliptical or in kick box or zumba?

I have a brand new 7th gen, someone suggested that I get this kit because it will work better than the accelerameter on the device.

I also use a Polar heart rate monitor will the app record the data as well?

Nike + iPod Sport Kit

Nike + iPod Sport Kit

Product No Longer Available

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