Use a very light weight and hold
it at various points in your rep of virtually any exercise. When doing a
barbell curl start at the bottom of the rep, move up a few inches, hold it
for a few seconds then move up a few inches, hold, move up a few inches,
hold, etc. Finish the rep doing this through the positive and the negative.
This helps to flush out all the
lactic acid that has been built up during you're workout and will also help
to reduce soreness