Was toying with how to make a moving practice target that anyone could replicate with the simplest materials, and that could be operated by one person. Motivation is to gain practice shooting at a target not sitting still, such as hogs on a spot-and-stalk hunt -- affectionately termed by some as "spook and shoot". 
Anyway, all that is needed for this rig is a couple of cheap metal fence posts (actually could use conduit, pipe, or a couple of handy trees), some ordinary string, 3 large paper clips, a piece of cardboard and spring grip clamp (as a forward weight).
Tie the string tautly at a fairly steep downward angle from one post to the other in front of your target butt or backstop. Stick a couple of the paper clips at the top of the cardboard piece at front and back and hook them over the string. Attach the clamp to the lower front corner of the cardboard. String angle needs to be steep enough for weighted cardboard to slide freely from the top toward the lower end of string. Once that angle is set to satisfaction, set the cardboard piece at the top and chock the leading paper clip with the third paperclip to hold it at the ready position. Tie a fairly long piece of string to this third paperclip and back up a few yards and make a loop in the other end large enough to put your foot through. This will be the "trigger" for the rig.
Once all is ready, with foot in trigger loop and an arrow is nocked in your bow, simply pull your foot with string loop to remove the paperclip chock, and then shoot the moving target.
Will add pics of all this via phone in a edit. Pics will show set-up and first three shots I took from about 5 yards. Only limitation to rig would be how much string you wanted to play out for trip wire.
Anyway, all that is needed for this rig is a couple of cheap metal fence posts (actually could use conduit, pipe, or a couple of handy trees), some ordinary string, 3 large paper clips, a piece of cardboard and spring grip clamp (as a forward weight).
Tie the string tautly at a fairly steep downward angle from one post to the other in front of your target butt or backstop. Stick a couple of the paper clips at the top of the cardboard piece at front and back and hook them over the string. Attach the clamp to the lower front corner of the cardboard. String angle needs to be steep enough for weighted cardboard to slide freely from the top toward the lower end of string. Once that angle is set to satisfaction, set the cardboard piece at the top and chock the leading paper clip with the third paperclip to hold it at the ready position. Tie a fairly long piece of string to this third paperclip and back up a few yards and make a loop in the other end large enough to put your foot through. This will be the "trigger" for the rig.
Once all is ready, with foot in trigger loop and an arrow is nocked in your bow, simply pull your foot with string loop to remove the paperclip chock, and then shoot the moving target.
Will add pics of all this via phone in a edit. Pics will show set-up and first three shots I took from about 5 yards. Only limitation to rig would be how much string you wanted to play out for trip wire.
I'll take that as a compliment. 
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