The Fitbit Tracker, a new wireless, wearable device the size of a book of matches, aims to take the guesswork out of staying fit.The legwork, however, remains up to you.

• 运动追踪者，一种新型可随身携带的装置，仅有火柴盒大小，将为你完成繁复的计数工作，当然跑腿儿的事仍旧由你自己干啦。