When a new workout is created, calculate and persist distance, calories, average, min, max rpm|bpm etc (Need to test this)

templates/new_workout.html

@@ -221,7 +221,7 @@
                         Accept: "application/json",
                         "Content-Type": "application/json",
                     },
-                    body: JSON.stringify({ workout: workoutData, heart_rate: heartRateData }),
+                    body: JSON.stringify({ cadence_readings: workoutData, heart_rate_readings: heartRateData }),
                 }).then(res => res.json())
                     .then(res => {
                         workoutData = [];