Here is one i like....

So i have my IPOD with the track of the bell ringing 2 mins go buy then it rings again then i rest then one minute then agains.. so on and so on.... well i have a buz that goes at the 30 second warning. and at that point i throw al out as fast as i can non stop punches up and down the bag.

i realy like doing this cuz you cant realy cheat yourself. if you do stuff like that in the middle or start, then you tend to coast at the end.

anyone else do this?