coaches anti fitness butts is the coming revolution in microprocessorcoupled exercise equipment. Most elaborate harbinger of the new generation of sweat-inducing apparatus is the Wilson/Ariel 4000, an exercise machine developed by computerbiomechanics specialist Dr. Gideon Ariel. It's now being readied for marketing by Wilson Sporting Goods, Chicago.

The machine is based on hydraulic resistance, which can be adjusted to

individual programs by the microprocessor. A user inserts his personal, lifetime diskette containing basic physical data. The computer reads it, tells you how much weight you've lost or gained and asks you what type of exercise you want to begin with. Along the way, it tells you how you're doing compared with past performances and norms for your age, sex, size and so on.

As of now, the prototype is being demonstrated for institutions-hotel chains, health spas. At $75,000 per unit, not too many of us will be snapping them up. But the company says it hopes to evolve home units, possibly in the $5,000 range, within two years.