Baby-G with Athletes in mind!
This is a watch that was made for runners, and all of its features show it.
A white band with a green cover, it's got a larger than usual display, so if you're using functions like a stopwatch, you can just glance at the screen and keep running without having to slow down.
If you're more into jogging at night (to avoid others or just because you want to try something different), you can always turn on the auto light switch, which will turn on the backlight whenever your watch is at an angle towards your face.
Do you enjoy swimming but are too worried about leaving your watch where anybody can just steal it? Well take it with you when you swim, since this has a 200m water resistance!
If that's not enough, Casio includes a 100m shock resistance with all of its watches, and this also comes with a mineral glass display, meaning that if you drop it, fall on it, as long as it's not over 100m, it'll still work perfectly and the display will be very hard to scratch.