user11385: I'm in need of flexible pressure sensors that can read how much force is exerted on someone's foot while running (these sensors would be placed inside the shoe). Since pressure can often be three times the weight of the person, I need something fairly strong. Are there fairly cheap sensors that are available or hacks that could do the same thing?
Thanks!

user6945: Sensors such as you describe are usually called "Load Cell".  
At the 600 pound weight, I haven't found any "flexible" load cells. A sensor would have to be quite robust.  
Flexible might not be the best answer.
This load cell page has quite a range of load cells, several thousand pounds, also not very inexpensive. 
This might be difficult to install in running shoes :  


11385: <p>I'm in need of flexible pressure sensors that can read how much force is exerted on someone's foot while running (these sensors would be placed inside the shoe). Since pressure can often be three times the weight of the person, I need something fairly strong. Are there fairly cheap sensors that are available or hacks that could do the same thing?</p>

<p>Thanks!</p>
 6945: <p>Sensors such as you describe are usually called "Load Cell".  </p>

<p>At the 600 pound weight, I haven't found any "flexible" load cells. A sensor would have to be quite robust.  </p>

<p>Flexible might not be the best answer.</p>

<p><a href="http://www.futek.com/product.aspx?t=load" rel="nofollow noreferrer">This load cell page</a> has quite a range of load cells, several thousand pounds, also not very inexpensive. </p>

<p>This might be difficult to install in running shoes :  </p>

<p><a href="https://i.stack.imgur.com/S0bFJ.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/S0bFJ.jpg" alt="enter image description here"></a></p>
