This does not seem like it should be the best practice. You calculate the square root twice when you could just store it once. Seems wasteful, especially if ever dealing with large numbers.

I personally would choose to go with 'name' instead of 'value' for the filter element name. I like the variable name to represent the data being worked with!

I agree with Cvillemus below. I'd break out or validate the walk count to 10 before iterating over the lists. You don't want to spend the time counting over a 50,000 step walk if you don't need to.