Do you have trouble pacing yourself while running? You could download a speedometer app for your iPhone. Or if gee-whiz is more your speed, hold out for this drone, currently in the works. The idea is that the drone—known as Joggobot—would fly a little bit ahead of you so you can regulate your speed. There are two modes—a rigorous “coach” setting that challenges you to keep up, plus a more casual mode that takes its cue from your pace.