muscle d fitness commercial selectorized vogue line website banner
muscle d fitness 3 stack megatron multi functional machine

TRUSTED BY 150,000+

GYM OWNERS,TRAINERS AND CELEBRITIES

CHOSEN BY 10,000+

FITNESS BUSINESSES FOR QUALITY

Fast Lead Time

Shop, click, boom – your fitness machine arrives before you even realize it!

Optional Professional Assembly Service

Pre-assembly option: stress-free setup, ready to go!

Secure payment

Your payment information is processed securely.

Selected Selectorzed Machine Blowout Event

View all

Blog Posts

View all
Everyone Can be MuscleDBrian Lewallen of Muscle Dynamics in a vintage product image

Beyond the Treadmill: The 1980s Fitness Revolution That Predicted the Future of Training

In the 1980s, Muscle Dynamics founder Brian Lewallen and physiologist Dr. Gregory Ellis developed the Spectrum Training System — a science-driven training philosophy that challenged aerobics cultur...

Gym Equipment AcademyMastering the Pectoral Fly: Proper Form and Science-Backed Techniques for Maximum Chest Hypertrophy

Mastering the Pectoral Fly: Proper Form and Science-Backed Techniques for Maximum Chest Hypertrophy

Master the pectoral fly with expert form cues for flat, incline, decline, pec deck, and cable variations. Build a stronger, fuller chest with biomechanics-backed technique.

Gym Equipment AcademyLat-Pulldown, Lat Pull, and Assisted Chin/Dip machines in a gym setting.

Pull-Ups vs. Lat Pulldowns: The Science-Backed Guide to Building a Wider, Stronger Back

Pull-ups and lat pulldowns are both elite vertical pulling movements — but which one builds a better back? We break down the biomechanics, EMG research, and how to program both using Muscle D Fitne...