I recently upgraded my smartphone to the Samsung Galaxy S5, and I’ve been playing around with the S Health app for a week and a half now. If you haven’t followed the Galaxy line of phones, the S5 comes with two hardware features that the S4 lacks: (1) a waterproof(!) casing; and (2) a heart rate monitor. In our rainy environment, the waterproofing is definitely a nice feature, although I’m too scared to test it…