Been reading a lot of posts about people using weight as an excuse to choose the Sports model. It struck me as ill-informed due to the weight differences of the Sport vs SS which is about 20 grams for the 42mm (case only, band not included). Let's put this into perspective. Every time you move, lift or manipulate your arm, you are expending energy. The average arm weighs about 5-7% of your total body weight. For argument's sake, let's use 5%. Assuming you weigh 150lbs, your arm would weigh about 7.5lbs. 7.5lbs in grams is 3400g. 20g, the difference between the Sport and SS is therefore about 0.5% of your arm weight. This number is less of course if you weigh more than 150lbs! Even if you weigh 100lbs (not uncommon for some petite women), that's only about 0.8% (still under 1% of your arm's weight). And this number is even less if you're contemplating the 38mm. Bottom line, you may notice a difference when trying the watch on in store, especially if you try both the Sport and SS in quick succession, but the argument is completely bananas to think that it will impact your workout, will tire you arm, or any other stories someone can think of for using weight as any kind of deciding factor. Time to be informed. Perceived weight differences between Sport and SS are simply FUD.