NBC - Can those popular fitness trackers really help with our exercise, diet and weight loss goals?
Researchers at Virginia Tech say it depends on how they are used!
They found some features on the devices were more effective than others.
For example - rewards or step reminders did not really enhance motivation.
And social interactions, like virtual challenges and rankings only appealed to those who already exercised.
Experts say users should customize the devices to suit their personal goals.