What is the fine-grained topic of the following text: In the February 16, 2016 issue of Annals of Internal Medicine, UPenn PRC Director Kevin Volpp, MD, PhD, UPenn PRC researcher David Asch, MD, MBA, and co-authors reported on a study to test the effectiveness of offering financial incentives to increase physical activity among overweight and obese adults. Only return the topic.
The effectiveness of using financial incentives to increase physical activity among overweight and obese adults.