According to this equation for glycolysis, what is reduced and where do the electrons go? I know that the glucose is oxidized into pyruvate but I don't understand what is reduced or where the electrons go.... 

Equation:
$\ce{Glucose + 2 ADP + 2 NAD^+ -&gt; 2 Pyruvate + 2 ATP + 2 NADH}$
NAD+ accepts a hydride ion (proton + 2 electrons) and is reduced to NADH.