Can you explain this in better and greater detail Im confused and dont understand the equatio " all depends on the specific geometry / architectural properties of the muscle being studied. It's 100% possible in some muscles that increases in fascicle length doesn't always result in muscle thickness. The key is that in muscles where [fiber/fascicle) length x cosine 0] is greater than one-half of the muscle length, then changes in fiber/ fascicle length will not impact the mid-bellyCSA of the muscle."