Exercise: Can you hack your routine?

Phoebe Connelly

Studies show it's incredibly difficult to trick the body into working harder than it wants to—our bodies automatically adjust to a pace when walking, for example, that minimizes the amount of energy burned.

Join Yahoo News at 12:30 p.m. ET when we'll be discussing exercise hacks—from the scientifically approved to what works for you. We want to hear your tips!