Oakland Raiders
Assistant Weight Coach
NFL-level strength and conditioning environment.
About John
Exercise science, strength-room experience, and a careful training lane.
John Overdorf founded Valhalla Training for adults who need a more deliberate bridge from clearance into strength, conditioning, and confidence.
Role clarity
John trains cleared clients. He does not replace medical care.
Valhalla Training is personal training and performance education. John can build training plans around provider restrictions when appropriate, but diagnosis, treatment, prescriptions, and clinical rehabilitation stay with licensed providers.
Training and performance education are not a substitute for medical care. Clients with serious injuries should be cleared by their physician, surgeon, or physical therapist before beginning. Peptide and hormone-related decisions require a licensed medical provider.
Verified credentials
Current proof, without inflated titles.
B.S. Exercise Science and Nutritional Biology
Certified Exercise Physiologist
Certified Personal Trainer
Certified in Peptides and Hormones
Certified TRX Instructor
CPR/AED
TODO: add issuing organizations, dates, and verification links after John confirms the exact certification bodies.
Career highlights
High-level rooms, local coaching.
Pacific Coast Health Club
Exercise Physiologist
Elite training facility experience with Olympic and professional athletes.
San Jose State University
Employee Fitness Exercise Physiologist
Four years supporting employee fitness programming.
Lehigh Valley and Allentown
Private Trainer
Five-plus years of in-person coaching in the local area.