No New Notifications

737 Harry McCarty Road, Bethlehem

10 Classes or Month of Unlimited Classes for at CrossFit Killer Instinct (Up to 88% Off)

Up to 88% Off
Select Option
Store Front Store Front Icon with Heart for Saving Local

Help Crossfit Killer Instinct

Support this business with a RISK-FREE purchase. If you're unable to use your local Groupon, you can trade it in for use toward any of our other great local businesses - until you either view the voucher or it expires.


CrossFit box filled with weightlifting mainstays hosts daily-changing workouts to sculpt strong, toned bodies regardless of fitness level

Customer Reviews

100% Verified Reviews
All reviews are from people who have redeemed deals with this merchant.
1 ratings1 reviews
February 24, 2018
I really enjoyed my first day. The coach (Pace) was awesome. Everyone there was nice, the gym is super clean and organized. I definitely got a great workout. I have a shoulder injury, and had no problem with scaled moves.
1 ratings1 reviews
December 19, 2017
First session was this morning. There was myself, the instructor, and 2 other people. It was very tough but the instructor was there every step of the way for encouragement and coaching.
4 ratings2 reviews
December 16, 2017
Great gym, and the people that attend the gym are so friendly!
4 ratings1 reviews
July 31, 2017
Awesome instructors who take the time to teach you form so you don't hurt yourself. Really good workout and great positive atmosphere! I'm planning on joining because I love it so much even though there are other crossfit gyms closer to my house. Can't say enough positive things about this place!
1 ratings1 reviews
July 21, 2017
Great instructors so far! Friendly, supportive members! Everyone is very encouraging! And unlike other crossfit gyms ice visited they actually coach you through the moves to make sure your form is all right! Definitely recommend!
2 ratings2 reviews
March 21, 2017
Love this place! Great trainers, and great people!
5 ratings4 reviews
February 19, 2018
Great atmosphere and facility.
5 ratings4 reviews
August 10, 2016
Very friendly atmosphere! Looking forward to working out with these guys.
See all reviews

What You'll Get

Choose Between Two Options

  • $22 for 10 CrossFit classes ($200 value)
  • $38 for a month of unlimited CrossFit classes ($160 value)

Building Muscle: Cells on the Move

Read on to learn exactly how fitness classes leave you with more muscle or better tone.

Bulky upper-body muscles might have hindered early humans who had to chase their prey across the plains, but it could help those who often had to climb trees to adjust their satellite dishes. That’s why the body builds muscle according mostly to use: do enough curls, and the biceps expand. As anyone who has experienced post-workout soreness could intuit, those curls are actually a form of controlled damage, making thousands of miniscule tears to the muscle tissue that beckon autoimmune cells to show up alongside testosterone and other hormones. The white blood cells help switch on satellite cells, which are similar to stem cells. Before they’re activated, satellite cells aren’t doing much—instead, they lie dormant around muscle fibers until they’re called into action to repair torn tissue.

This isn’t the only kind of cellular transformation at work in growing muscles. Long muscle cells, which contain several nuclei, can also begin to change type after a workout. Certain kinds of muscle fibers are equipped to handle brief bursts of effort but will quickly become tired if asked to do more intense work. These are the first to disappear as someone starts an exercise routine, as they’re converted into fibers with more endurance. This principle is so dramatic that a sports scientist can generally tell whether someone is a professional athlete or a professional mattress model by examining a minute sample of muscle tissue.

The Fine Print

Promotional value expires 90 days after purchase. Amount paid never expires. Not valid for clients active within the past 2 months. Must activate by expiration date on voucher; membership expires 90 days from activation date. Limit 1 per person, may buy 1 additional as a gift. Limit 1 per visit. May redeem across visits. Valid only for option purchased. All goods or services must be used by the same person. Merchant is solely responsible to purchasers for the care and quality of the advertised goods and services.

Crossfit Killer Instinct

Fitness Class, Crossfit