What Is SuperSlow®?
"SuperSlow is an exercise protocol whereby the weight is lifted in approximately 10 seconds and lowered in five seconds. It is the protocol that best fits The Definition of Exercise, and is the protocol of choice for research, rehabilitation, bodybuilding and all general exercise. It can be used with any kind of resistance equipment: free weights, Nautilus or other machines, or calisthenics (dry land) exercises.
[Please note: Most of the information in this section is taken from SuperSlow: The Ultimate Exercise Protocol, 2nd Ed. by Ken Hutchins, ©1993]
Why So Slow?
• Slow movement reduces force - the number one cause of injury when exercising.
• Slow movement minimizes momentum, which improves fiber recruitment and makes it easier to attain deeper inroad.
• SuperSlow is safer and more productive than any other form of training."
Someone mailed me this
Anybody here seen it before?
BigC, Superslow is a technique that is normally used in circuit training facilities. It's not a good idea to do it with free-weights or cables and if you do, at least not all the time. When people circuit train

, they go through a series of about 8 machines or so, each of which targets a certain muscle group. Because their muscles / body gets accustomed to the machines after a while, they could try the superslow technique, since that would stress the muscle in a different way.
If you do a conventional set on a machine in the circuit, you'd normally use a '2 seconds positive, 4 seconds negative' tempo and should aim to reach failure between 8 - 12 reps. If you use superslow, you'd use a '10 seconds positive, 5 seconds negative' tempo and should aim to fail around 4 - 6 reps.
I work in a corporate health club (part-time) which primarily promotes circuit training, since they can have 1 instructor supervise 2 - 3 machines, meaning there's 3 instructors for the whole circuit. This is so every time a person does the circuit, they'd (ideally) be supervised by an instructor on each machine, making it go pretty close to having a personal trainer without the (relatively) high rates a PT would charge. The catch is that they get that amount of supervision only in the circuit and when they go out to the free-weights area, they're mostly left on their own.