Put on a heavy weight, do the
negative part of the rep, and have your partner help you lift it back up,
then do another negative, this is a great method in increasing your max rep
for any exercise.
Try targeting your max for bench
presses, put on an extra 10 pounds to your current max and do negatives with
that weight. This helps to get you used to this weight and forces your body
to adapt to the heavy weight.
