You have a 8 mile run planned while youngest is at preschool and it is raining. You normally would run outside but hubby is out of town and your one of those paranoid moms who worries about what could happen during 2 1/2 hrs of preschool and no parental contact. So I planned on running outside with iPhone but now with the rain am not wanting to risk a ziplocbagged iPhone. So option B- run 8 miles on treadmill. I'll let you know how that goes and what the Frick I did for 8 miles on "hamster wheel".