Answer
$P \approx 340 W$
Work Step by Step
We will estimate that you weigh about 70 kg and that you go down about .5 m in the process of doing the bend. We then find:
$P = \frac{dW}{dt} \approx \frac{\Delta W}{\Delta T} = \frac{mgh}{t}$
$ P = \frac{mgh}{t}= \frac{70kg*9.8m/s^2*.5m}{1s}$
$P \approx 340 W$
