Last week, Silicon Valley-based startup Striiv announced plans for a portable fitness device that blends fitness and gaming with something a bit unexpected -- charitable donations.

By being active, such as taking the stairs instead of the elevator, users can earn points to donate to real-world charities, at no extra cost to them. The device partners with GlobalGiving to help a range of projects around the globe, including aiding drought victims in Ethiopia or providing vital medicines to children in India.