Fitness: Diesel Fitness offers high-powered workout

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The core of Diesel is personal training, and Sam Mulroy makes suretrainers subscribe to his philosophy.
"I'm a big believer in circuit training and keeping the heartrate up the whole workout," he says. "Unless you have aheart condition, there's no other way to train."
He also advocates multijoint exercises, combining squats withcurls, for example. "The bigger the muscle you use, the morecalories you're going to burn."
With clients, he'll run through each circuit three times, then moveto another, making sure to keep changing things so the body neverhas a chance to adjust and stop progressing. And he doesn't stopuntil a client's form starts slipping, a sure sign that muscleshave reached exhaustion.
CONTACT: Diesel Fitness, 3111 Welborn St.; 214-219-6400, www.dieselfitness214.com . With a package of six personal training sessions for $299,there's no enrollment fee and the monthly membership fee is $19.95.Without the training package, enrollment is $99 and the monthly feeis $24.99 (a free physical assessment is included).