Strength is Pure

Webster's Dictionary defines the following:

Strength, n. 1. power of the muscles.
2. resistance to force.
3. ability of the mind.
4. purity.

purity? Like a refinement process?

Let me tell you, I just had a fantastic run. From my house, down American River, up Westville, down Pointed Rocks, up Paymaster, and back to American River. I waited a bit to long though- the sun shined down and really heated me up. I always wear shorts, but elected for long sleeves today. Yank them up! My leg started out in pain, but once I got going, it subsided and let me smile the rest of the route. These new arch supports are cushy.

hmmm, purity...what do ya think? Our strength? How is strength pure?