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1.The jumping jacks increased my heart rate the most probably because I'm moving my arms and legs at the same time.
2. Sitting down increased my heart the least because I didn't have to move unless you count things like breathing.
3. I did not predict correctly I assumed that sprinting in place would get my heart rate up the most without a doubt.
4. My heart rate increased as I became more active.
5. I think my heart rate increased when I became more active because I needed more blood and nutrients so my heart pumped more blood and it pumped it faster than usual.