Calories Burned

Can anyone recommend what I can buy so that I can track what I'm burning when I exercise as I am starting Jillian Michael's 30 Day Slimdown next week which is a mixture of some of her DVD's but I have no idea what to eat back in cals burned?

If it helps I live in the UK so would rather recommendations that I can buy in the country so I get it quickly.

Thanks x

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