Roughly 85% of New Year's resolutions never make it past the hypothetical phase, according to an unfinished study that was abandoned in early February. Stick to your fitness goals with today's Groupon: for $40, you get five classes at Tread Fitness on Lemmon Avenue (a $90 value).

Tread Fitness rescues gymless wanderers from fitness ruts and returns them to the path of dynamic exercise, employing a program that emphasizes the acceleration of metabolism, toning muscle, and building strength. The challenging and exhilarating group classes are motivating and help develop solidarity between exhausted yet energized fellow muscle owners. Through the Abs & Arms course, skilled trainers lead a series of weight repetitions and cardiovascular interludes to chisel limbs and flatten torsos. Meanwhile, during the 54 thumping minutes of Tread54, each muscle will flex and burn from multiple six-minute segments that include throwing punches, jumping rope, running circuits, and circus bloopers (see schedule here). Bring a towel and water to your workouts.

Reviews

The Dallas Morning News, 33 News, Texas Style and Substance, and many more recommend Tread Fitness for an intense yet satisfying workout. More than 600 Facebookers follow Tread Fitness.

• There is major camaraderie here - everyone is giving each other the same knowing looks "This is hard" and once you're done "I can't believe we just did that" and you walk out feeling exhilarated. – KR, Texas Style and Substance
• One of the nicest aspects of interval training is that all fitness levels are welcome – everyone sets their own baseline and intensifies the pace at their own speed. – Farah Fleurima, Dallas Morning News