Justin Killeen, M.S.

Early in 2012, I was driving around Amherst, Hadley, and Northampton looking for local gyms that may be hiring. I was a (relatively) experienced trainer, recent UMass graduate, and circumstances led me to stay in the area longer than I originally anticipated.
I came across a small gym called “Energia Studios”, nestled in next to Hillside Pizza on Route 9. To be quite honest, I think it was because I was getting a slice of pizza for lunch that day. I was intrigued by it, but each time I returned (not for pizza!), the lights were out and the door was locked. Finally, frustrated, I left my resume taped to the door.
Several weeks later, I got a call back, interviewed, and was hired as the personal trainer. I began two other jobs as well. Eventually, I decided that none of it seemed right for me. On a whim, I started “Pioneer Valley Fitness”, what was a mobile or on-site personal training business. I began to really grow as a personal trainer, working with dozens of people out of their homes and workplaces, emphasizing functional movement and injury prevention. Concurrently, I trained the other half of my time at Energia, as I began to get to know and truly embrace the clientele. It was the one job I just couldn’t leave.
Finally, the opportunity presented itself for me to become Spin certified.
From there, it seems as if the rest is history! In that time, I’ve completed my Master’s degree, purchased and and worked to re-brand the first studio, while recently opening our second location, “50/50 Fitness/Nutrition”. I can, without a doubt, say that none of it would have been possible without some truly amazing people who have been there to help and support me from day one. This new brand really embodies our shared vision for the future, and I’m extremely excited to be given the opportunity to present it to you.
So, with all that being said, welcome to the community!



Blog Post: Do You Believe in Second Chances?

Justin  Killeen’s Certifications:

  • ASCM Certified Personal Trainer
  • NSCA Certified Strength & Conditioning Specialist
  • TRX Suspension Training
  • Certified Spinning Instructor
  • Functional Movement Screen – Level 2 Certified
  • Exercise is Medicine – Level 1 Certified

Sarah Blackmore

Sarah has always lived and worked in the Pioneer Valley, where it is easy to develop a passion for a fit and healthy lifestyle. Her lifelong interest in fitness began with gymnastics and continued through high school where she ran track. As an adult, she continued to run, but explored other fitness programs. She was introduced to spinning and it wasn’t long before she was certified and instructing. To provide a fitness experience for her clients where she can motivate people through life changes and transitions while witnessing the growth and confidence they develop is one of the things she loves about instructing.

She is continually challenging herself and has received many awards for her performance at local races. She loves to push herself in and out of the gym; and loves that moment of accomplishment in what seemed impossible only a short time ago. To Sarah, the 50/50 Community has shown her a ton of support and encouragement through her own personal growth. Sarah passes that on to her clients in her classes providing progressions so that members see their own growth and strength as well. In addition to her 50/50 Instructor role, Sarah has been a hairstylist in Northampton for the past 13 years.



  • Certified Spinning® Instructor, CPR/AED