Advanced Strength and Speed Strategies
Advanced Strength & Speed Strategies by Dr. Hartle is dedicated to getting you kettlebell & barbell strong—bringing your iron game to the next level!
Press strong. Then press strong again.
Dr. Hartle coaching a student through kettlebell pressing at the Denver SFL Certification.
While the SFL is built around the barbell, the kettlebell remains a valuable tool for developing shoulder stability, pressing strength, coordination, and resilience.
Different tool. Same standard.
Strong is strong.
05/20/2026
CONGRATULATIONS to the new SFL Barbell Certified Instructors at the 2026 Denver StrongFirst Certification!
Welcome to the School of Strength!
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Fort Wayne, IN