But first, how far away are you? Can you reach it with your fingers? Your elbow? Knee? How much will you have to stretch?
OK, go ahead.
Were you right? If not, how far off were you? What do you have to change to be where you thought you were?
You can do this almost anywhere to get better and better at judging distance in relationship to your body and understanding the space around you. Just be careful what you touch. Some things can get you in trouble.