Can someone tell me a very very simple physics experiment topic that links to biology?

Explanation:

One idea would be to investigate the correlation between your pulse pressure and your pulse rate.  To do this, you'll need a blood pressure monitor.

First, measure your resting pressure and rate.  Then exercise for 30 seconds.  Measure your new blood pressure and pulse rate.  Wait for your pressure and rate to return to normal, then repeat the trial for 1 minute, 1.5 minutes, 2 minutes, etc.

List the results in a table.  This should include the amount of exercise time, your pulse rate, your systolic pressure (the high number, which is your blood pressure during contraction of your heart muscle), and your diastolic pressure (the low number, which is your blood pressure between heartbeats).  Calculate your pulse pressure (systolic minus diastolic) for each trial.  Graph the pulse pressure on the x-axis, and your pulse rate (beats per minute) on the y-axis.

What do you hypothesize will be the shape of the graph?  Consider Bernoulli's formula, which relates fluid pressure and flow.  How close do the results match your hypothesis?  What might explain any differences?