I've gardened the raised bed method since before Dirt and I were married. Part of the whole raised bed method is placing things equi-distance from each other not in plain rows. When Dirt made this tool for me it really helped. But just like measuring cups you shouldn't have just one size, you need one for each spacing size. Or else you just do it with a swing of your thumb and fingers and readjust a little when you notice your pattern is off a slight bit. The years before Dirt built my prototype for all the other spacings, I was very good at knowing the distance for the span between my thumb and each finger. Or how much to bend a finger to adjust it just so to make it an inch closer.
Planting time is the best substitute for doing squats in the gym! After an afternoon of this my hiny muscles know that they have been used.