Redwood City, Calif. -- Zamzee, a Redwood City-based startup developing an online rewards program for teens powered by their physical activity, has named Jonathan Attwood as its CEO. Attwood founded the London-based SwapitShop online trading community for teenagers in 2000, serving as CEO until 2009. He has also served as a management consultant and advisor for various product development projects and financial services companies. The company also has named former investment banker Lance Henderson as its COO, and said it is actively recruiting additional team members. Zamzee was founded in 2010 with an initial equity investment of $1 million by Pam and Pierre Omidyar's HopeLab Foundation. The company said its goal is to get large numbers of teens to be more physically active. To earn rewards, teens wear the Zamzee meter, a three-axis accelerometer specially calibrated to record short bursts of movement as well as vigorous activity. Recorded physical activity then powers a teen's online account, which can be converted into virtual currency.