"I be up in the gym just working on my fitness..." -Fergie
Recently, I've been trying to get into better shape so I've been going to the gym. As part of my cardio routine, I grudgingly run on the treadmill. After about 15 minutes I find that my knees are in unbelievable pain (gosh, I despise the treadmill)! I have realized the reason for my knee pain! It has to do with Newton's Third Law! As I'm running on the treadmill, my feet are putting a force on the treadmill, and the treadmill puts a force back on my body. Though I have a greater acceleration than the mostly still machine, the machine has much more mass than I, and though the same force is pushed back, I still feel more pain in my joints. After icing my knees and calves, and shedding a few tears, I've come to the conclusion that I will take some time off of the treadmill and work on other cardio machines to avoid possible amputation of my legs!!! That was a bit dramatic but anyone who has run on a treadmill for a while knows the pain that I am referring to. I blame physics for my aches and pains
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