The most secretive body parts are muscles, which hide behind layers of skin and appear only occasionally to help lift cars off trapped kittens. Flex your biceps in the absence of a cat emergency with today's Groupon to Global Fitness Centre. Choose between the following options:

• For $35, you get a one-month Silver Lifestyle membership and unlimited yoga (a $100 value).
• For $50, you get five drop-in CrossFit classes (a $100 value).

Global Fitness immerses gym-goers in a sprawling athletic wonderland encompassing 80,000 square feet of group fitness studios, racquet courts, and functional training rooms. After a personalized fitness assessment, clients with the Silver Lifestyle membership can pump pedals and test odometers in a 30-minute Cycle Power class or spark caloric bonfires in the commodious racquet centre. The haven for court-bound pursuits consists of two outdoor and three indoor tennis courts, five squash courts, a traffic court for settling speeding tickets, and five racquetball cells. The membership further endows patrons with unlimited yoga sessions helmed by six body-bending yogis in a newly renovated studio.

Global Fitness also challenges clients with its intensive drop-in CrossFit program, implementing resistance training in high-speed aerobic circuits. The elite CrossFit studio houses a full stock of medicine balls, kettlebells, and handbells for midworkout carolling. Reservations are required.