Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: It appears that enthusiasm for fitness devices to measure how much exercise a person has done is falling, anecdotal research shows. Deepak Jayasimha's fitness tracker is now with his father-in-law in India, where it sits unused. Annabel Kelly foisted hers off on the kids. And although sales of Fitbit and other fitness trackers are strong, many of their owners admit that they lose enthusiasm for them once the novelty of knowing how many steps they've taken wears off. One research firm, Endeavour Partners, estimates that about a third of these trackers get abandoned after six months. A health care investment fund, Rock Health, says Fitbit's regulatory filings suggest that only half of Fitbit's nearly 20 million registered users were still active as of the first quarter of 2015.Sales of Fitbit and other fitness trackers like Basis Peak are still strongFitbit earned $132 million last year on revenue of $745 millionBut many of their owners admit that they lose enthusiasm for them quicklyResearch suggests about a third get abandoned after six monthsOwners do not throw them away they pass them on to relatives to use 
 Question:_ added that people who regularly use their devices make healthier choices.

Fitbit