Before usage you are required to create your own application using the RunKeeper partner portal
var context = new RunKeeper.Context('clientID', 'clientSecret');
if (context.connect()) {
// Use context.
}
var weightData = context.getWeightFeed();
while (weightData.moveNext()) {
var date = weightData.current.timestamp;
var weight = weightData.current.weight;
var fat_percent = weightData.current.fat_percent;
}
// Add weight
context.setWeight(new Date(1984, 7, 30), 75.4);
// Add weight and fat percent
context.setWeight(new Date(1984, 7, 30), 75.4, 16.2);