A training script device is described that conveniently allows a user to create a training script defining one or more steps of a workout routine, where each step may include an activity, a duration for performing that activity, and an intensity at which the activity is to be performed. Further, one or more steps of the training script can be self-starting in response to performance data detected by sensors of training script device executing the training script. This conveniently frees the athlete from having to continuously monitor the status of his or her workout activities. Still further, the training script device conveniently allows a user to transfer training scripts to other training script devices, so that athletes can share successful training scripts.