kristen sileo​​

contact Gus Directly

Via Phone/Email or the contact Form


Personal Trainer

sports ​Nutritionist

​Group Fitness INstructor

contact Derek Directly

Via Phone/Email or the contact Form


With Seven Years of industry experience, Kristen holds certifications such as: Master Personal Trainer, Sports Nutritionist, Group Exercise Fitness Instructor and Conditioning Specialist. Co-Owner of: Old Skool Iron Training and Team Old Skool Iron, Kristen also trains competitive athletes on the Amateur and Professional levels. As well, She conducts her own, “In-Home” training business for the Long Valley community and several surrounding counties. For a more in depth look into Kristen, you can go to: or find her on Instagram @kristensileo816 @ositraining 




Athletic Trainer
Certified Strength & Conditioning Specialist
Certified Speed & Agility Specialist

With Twenty Years of Amateur and Professional training experience, Kevin holds numerous certifications including: Athletic Trainer, CSCS, CSAS, Sports Nutritionist, Medical Exercise Program Director, Conditioning Specialist, Biomechanics Specialist, Dual Master PT, Group Exercise Instructor, Kettlebell Specialist, Spin Instructor, and TRX Specialist. He’s the Founder and Owner of: Old Skool Iron, Old Skool Iron Training and Team Old Skool Iron and trains individuals and teams on the: Youth, High School, Collegiate and Professional levels. Raised in Long Valley, NJ, Kevin came up thru the Local and Scholastic Athletic organizations and is actively involved in giving back to those programs and the Long Valley community. For a further look into Kevin, go to: OR @kevinjspeicher @ositraining @teamoldskooliron on Instagram. He’s also on Facebook under, Kevin J Speicher and runs a FB GROUP called, OLD SKOOL IRON. 

NPC competitor, BPI Athlete

​​Kevin J. Speicher


contact KRisten Directly

Via Phone/Email or the contact Form


Call Now... (908) 867-7561

contact Kevin Directly

Via Phone/Email or the contact Form

CELL: 908-210-0901

Gustavo Mujica

Derek is a physical preparation and fitness coach. graduated from Montclair State University with a B.S in Exercise Science and is also a Certified Strength and Conditioning Specialist (CSCS) through the NSCA. Through various jobs and internships, Derek has worked with a variety of athletes and clientele, including NFL athletes, professional and college baseball players, Olympic athletes, high school and youth athletes, and other individuals looking to stay healthy. His belief is that whether you are an elite level athlete or just someone looking to stay in shape, it all starts with good movement. 
    Derek has been involved in athletics his entire life, but it wasn’t until college that he realized that training was his true passion. Since then, most of his free time has been dedicated towards learning newer and better ways to develop athletes. Whether it’s through reading research articles, attending seminars, or utilizing online resources, Derek is continuously seeking to improve himself as a coach. 

B.S Exercise Science Montclair State University
Certified Strength & Conditioning Specialist (CSCS)
CPR/AED Certified

Your Trainer. Your PERFORMANCE.

Stronger, Leaner, Faster... Whatever your goals we will match you with the perfect trainer.   ​Because when you connect with the perfect trainer results can be epic. 

Gustavo's Bio Coming Soon... 

Make the impossible Happen

You Can, and you will. with the right personal trainer at zs fitness you will break records, tear down walls, and achieve the extraordinary. 

Discover how personal training is the perfect compliment to your membership at ZS Fitness 

​​Derek Kambour

Biomechanics Specialist
Conditioning Specialist
Sports Nutritionist
Dual Master PT