Group Fitness Classes on Hawaii Island with Sara Krosch
Movement
& Motivation
to Music
Join us for weekly in-person
strength focused group fitness classes on Hawaii Island
CURRENT group fitness CLASSES
Classes are held Fridays 4pm at the Puna Hongwanji in Kea'au, East Hawaii Island. Starting in February I will add 2 classes Wednesdays at the YMCA in Hilo. Sessions feature strength-focused formats created and taught by Sara Krosch. Bring a mat, weights and water to class. All other equipment provided. See class descriptions and the current class schedule below.
Flex & Flow/Pactive Fitness
This 45 minute class covers all the bases of physical fitness: cardio, strength, balance & flexibility. Class consists of a warm up, resistance segments using dumbbells and an optional looped resistance band, cardio section to get our hearts pumping, core strength segment and a yoga-inspired flow focusing on stretching and mobility. New choreography every class so you'll never get bored! Options are given for low to moderate intensity.
Bring your own mat and light to medium weight dumbbells. All other equipment provided.
Muscle Hustle
This 45 minute interval training class maximizes every minute. Class consists of a warm up and 7, 5 minute segments of alternating 30 seconds work/10 seconds break. Fresh choreography each class focusing on upper body, lower body, and core strength utilizing compound moves with body weight, dumbbells and an optional looped resistance band. Options are given for low to moderate intensity.
Bring your own mat and light to medium weight dumbbells. All other equipment provided.
Last Friday Class Each Month in Kea'au
Monthly Mash-up
Finish the month with this 45 minute session that combines the best blocks from recent Pactive Fitness and Muscle Hustle classes!
Class consists of a warm-up, 3 interval blocks focusing on strength, 3 choregraphed blocks stressing cardio, flexibility/balance, and core before cooldown stretches. Master compound moves with body weight, dumbbells, looped resistance bands, gliding disks, and balls. Options are given for low to moderate impact.
Bring your own mat and light to medium weight dumbbells. All other equipment provided.
January - February 2026 Class Calendar
No In-Person Classes Friday January 23 & Wednesday February 11
| Date |
Class Format |
Time |
Location |
| Fri Jan 2 |
Pactive Fitness |
4-4:45pm |
Puna Hongwanji |
| Fri Jan 9 |
Muscle Hustle |
4-4:45pm |
Puna Hongwanji |
| Fri Jan 16 |
Pactive Fitness |
4-4:45pm |
Puna Hongwanji |
| Fri Jan 30 |
NEW Class: Monthly Mash-Up |
4-4:45pm |
Puna Hongwanji |
| Wed Feb 4 |
Flex & Flow |
3-3:45pm |
YMCA Hilo |
| Wed Feb 4 |
Muscle Hustle |
4-4:45pm |
YMCA Hilo |
| Fri Feb 6 |
Muscle Hustle |
4-4:45pm |
Puna Hongwanji |
| Fri Feb 13 |
Valentine's Pactive Fitness
wear red or pink and class is FREE
|
4-4:45pm |
Puna Hongwanji |
| Wed Feb 18 |
Flex & Flow |
3-3:45pm |
YMCA Hilo |
| Wed Feb 18 |
Muscle Hustle |
4-4:45pm |
YMCA Hilo |
| Fri Feb 20 |
Muscle Hustle |
4-4:45pm |
Puna Hongwanji |
| Wed Feb 25 |
Flex & Flow |
3-3:45pm |
YMCA Hilo |
| Wed Feb 25 |
Muscle Hustle |
4-4:45pm |
YMCA Hilo |
| Fri Feb 27 |
Monthly Mash-Up |
4-4:45pm |
Puna Hongwanji |
Two East Hawaii Island Locations
Fridays at the Puna Hongwanji Community Hall in Kea'au. Cash, Venmo or punch cards accepted at this location.
Kea'au Directions
Wednesdays at the YMCA in Hilo. Non-YMCA members pay $10 drop in rate.
HILO DIRECTIONS
Save with a Punch Card
Try your first Big Island Active class for free!
Individual classes are $7 or save with a 5-class punch card for $30. Pay with cash, card, or Venmo.
NOTE- Punch cards purchased in 2026 expire after 3 months. Punch cards are only accepted at the Puna Hongwanji location.
Try a Class On-Demand
Visit the Big Island Active YouTube Channel for a variety of recorded classes including Pactive Fitness, Muscle Hustle, PiYo, P90X, Barre, Foam Rolling Workshops and more.
visit BIA YouTube channel
Newest BIA Workout Videos
Sara Krosch
Meet your Instructor
- ACE Certified Personal Trainer & Group Fitness Instructor
- National Board Certified Health & Wellness Coach
- RRCA Certified Running Coach
- Yoga Body Certified Breath Coach
- Certified National Diabetes Prevention Program Coach
- Founder & Director of Vivawell, Hawaii Island-based health promotion nonprofit organization
- MA- Health Communication & Promotion
- BS-Teaching
- 20 years community health program experience
- 9 years group fitness instruction
- Group fitness format creator: Flex & Flow/Pactive Fitness, Muscle Hustle, AMRAP & Roll
- Workshop creator: Breath for Heath and Stretch & Roll
- Program creator: Walkstars-Walking for Fitness, GLOW: Green Light on Wellness
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