For 10 years, the instructors and trainers at Gables Fitness have help clients achieve their fitness and weight loss goals. Now the workout institution has reopened its doors as Red Zone Fitness, where clients choose their workout duration, even in group classes. With 30-minute one-on-one or group personal-training sessions or 40- to 50-minute group fitness classes, the fitness studio follows the FITT principle: Frequency, Intensity, Time, and Type. Sessions depend on various factors that include strength aerobics, performance goal focus, exercise biomechanics, and effort. Experienced instructors lead students through group fitness classes that include spinning and Red Zone training, a group class for women that provides a heart-rate-monitored, full-body workout and strengthens the cardiovascular system in just 40 minutes.