Pilates combines mental toughness with physical strength, much like solving a Sudoku puzzle engraved in stone. Chisel a more balanced mind-body connection with today's Groupon to Karna Fitness. Choose between the following options in either Charlestown or Newtonville locations:

• For $39, you get a 10-class Pilates session (a $99 value).

• For $59, you get a new Pilates student package (a $148 total value) that includes:
  • 10-class Pilates session (a $99 value)
  • New-student equipment package (a $49 value)

Karna Fitness's Pilates classes require students to bring the following items to each session, all of which are included in the new-student equipment package:

• Slastix covered resistance tube
• Flat band
• Pilates-ball set
• Karna Fitness water bottle
• Karna Fitness nylon backpack

Karna Fitness sculpts lithe silhouettes with physically intense Restore the Core classes that engage musculature with prop-assisted Pilates exercises. Capping class attendance at 15 students, the studios' instructors dole out a winning combination of individualized attention and knock-knock jokes during each 60-minute class. An arsenal of student-provided resistance bands and Pilates balls (bought separately or included in the new-student-equipment-package option) augment the intensity of the abdomen-toning sessions while tightening waistlines. By placing its sole emphasis on core strength with these sessions, Karna Fitness caters to attendees seeking a low-impact workout without the hassle of renting a zero-gravity simulator.

Each location is currently hosting Restore the Core classes from 7:30 p.m. to 8:30 p.m. on Tuesday nights, although additional sections will be added in future months.