If exercising in the Hawaii Chair seems like way too much work, prepare for a "revolution." The Shake Weight for Men vows that within 10 seconds, its workout "is going to kick your butt." At six minutes per day, users can whittle down the repetitions that free weights require, working multiple muscles in multiple directions all at once. How does the magic happen? Dynamic inertia, obviously. If that explanation fails to extract $29.95 from your wallet, how about the revelation that the piston-like motion of the machine jolts your muscles at up to 240 contractions per minute? Also, you get to look like you're pleasuring yourself. So, there's that.