using FitnessApp;
var tracker = new FitnessTracker { DistanceRunInKm = 10 };
dynamic result = tracker.GetDistance("metric");
Console.WriteLine($"Metric result type: {result.GetType()}, value: {result}");
result = tracker.GetDistance("imperial");
Console.WriteLine($"Imperial result type: {result.GetType()}, value: {result}");