One, Two, or Three Months of Insanity Fitness Classes at Pena's Fitness Method (Up to 73% Off)

Midtown Center

from $25
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Value Discount You Save
$80 69% $55
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Choose from Three Options

  • $25 for one month of Insanity fitness classes (8 classes) ($80 value)
  • $45 for two months of Insanity fitness classes (16 classes) ($160 value)
  • $65 for three months of Insanity fitness classes (24 classes) ($240 value)

Muscle Confusion: An Undulating Path to Strength Gains

Learn the secret to overcoming fitness plateaus with Groupon's guide to muscle confusion.

Study muscle growth in any depth and you might easily reach this conclusion: muscles are kind of lazy. When you work out, your muscles go through an adaption period, growing so that they can handle the extra stress being put on them. But when they’re exposed to the same amount of stress or intensity all the time, they get used to it and promptly stop making gains. To overcome this plateau and destroy muscles’ attitude of smug complacency, trainers might prescribe a program of muscle confusion. That means strategically mixing up the order of workouts, the amount of resistance, length of rest periods, intensity, or other factors so no muscle group gets too familiar with the move.

Charles Poliquin, an athletic trainer who has designed workouts for 17 Olympic sports and for professional sports teams, is most often credited with introducing the concept physiologically known as undulating or nonlinear periodization in 1988. “Nonlinear” refers to the constant fluctuation in workout intensity (as opposed to progressing methodically through higher weight loads, for instance), and “periodization” refers to a specific plan for cycling through workout changes in order to give all the muscles enough attention.

Some studies have found muscle confusion, as it’s now commonly called, to be more effective in promoting long-term fitness and in boosting performance levels, and popular workout systems such as P90X and Insanity plan their intense regimens according to these principles. But if you prefer the comfort of a predictable routine, other experts are on hand to back you up, noting that if you’re focusing on a specific muscle group it may take weeks to get all you can out of a given move.

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    Midtown Center

    109 east 50th st

    new york, New York 10022

    917-302-0319

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In a Nutshell

Group fitness classes use the "Insanity" method to blast fat and tone muscle for long-term fitness

The Fine Print

Expires 180 days after purchase. Limit 1 per person, may buy 1 additional as gift. Valid only for option purchased. Valid only for customers who have not been in 6 months Merchant is solely responsible to purchasers for the care and quality of the advertised goods and services.

For those who take care of their overall well-being with exercise, yoga, and balanced nutrition
Warm weather essentials that prep bods for the sun with tanning, toning, and beach-ready apparel
Choose your deal:
1 Month of Insanity Classes (8 classes)
$80 list price - 69% off - Save $55
Over 10 bought
$25
2 Months of Insanity Classes (16 classes)
$160 list price - 72% off - Save $115
Sold Out
6 bought
$45
3 Months of Insanity Classes (24 classes)
$240 list price - 73% off - Save $175
5 bought
$65