Hoist Pec Fly/Rear Delt - HD-3900 Platinum

Hoist Pec Fly/Rear Delt - HD-3900 Platinum

The HOIST Pec Fly/Rear Delt swiveling handles with pivoting hand grips, provide a variety of hand positions for both exercises. Easy to reach range-of-motion adjustments for both arms with 11 positions come standard. Each exercise arm has dual pivots, allowing users to define their own exercise path. And with seven seat pad adjustments, users of all heights can easily find a safe and comfortable position for both exercises. Unique features such as patented Silent Steel Weight Racks make HOIST HD Dual Series the stand-out choice for prestigious gym brands, hotels and universities around the world.

Features

• Swiveling handles with rotating grips provide multiple hand positions
  
• Multiple range-of-motion adjustments for both exercises
  
• Each exercise arm has dual pivots for user-defined exercise path
  
• Seven seat pad adjustments for varying user heights
  
• Weight Stack Standard 310 lbs (141 kg)

What our Experts Think

• Elite dual-function design: Combines pec fly and rear delt training in one commercial-grade machine for complete chest and posterior shoulder development
• Natural biomechanics control: Independent arms with dual pivot points allow users to define their own movement path for smoother, joint-friendly reps
• Maximum adjustability: Multiple range-of-motion settings (11 positions) let users fine-tune stretch and contraction for both exercises
• Superior grip versatility: Swiveling handles with rotating grips and Flip-N-Grip options support multiple hand positions for better muscle targeting
• User-friendly setup: Seven-seat adjustment system ensures correct alignment for all body sizes and consistent form under load
• Balanced isolation focus: Smooth transition between pec fly and rear delt modes improves training efficiency without changing machines
• Commercial durability: Heavy-duty HD Dual Series frame (~649 lb machine weight) built for constant use in high-traffic gyms
• Premium feel & operation: Silent Steel® weight stack system ensures quiet, controlled movement during every rep

Q&A

Q1: What is the Hoist HD-3900 used for?
A: It is a commercial dual-function machine designed for pec fly (chest isolation) and rear delt (rear shoulder) training, targeting chest, upper back, and shoulder development in one unit.

Q2: What makes the HD-3900 different from standard pec deck machines?
A: It features dual pivot arms and user-defined movement paths, allowing each arm to move independently for a more natural and biomechanically accurate range of motion.

Q3: How does it improve workout versatility?
A: Swiveling handles with rotating grips provide multiple hand positions, making it easy to switch between pec fly and rear delt exercises without changing machines.

Q4: Is the movement adjustable for different users?
A: Yes, it includes up to 11 range-of-motion adjustments and 7 seat pad positions to fit users of all heights and training needs.

Q5: What muscles does it target?
A: It primarily targets the pectoralis major (chest) during flys and the rear deltoids, rhomboids, and upper back during reverse flys.

Q6: What is the weight stack capacity?
A: The standard configuration includes a 310 lb selectorized weight stack for progressive resistance training.

Q7: Is it suitable for commercial gyms?
A: Yes, it is built for heavy commercial use with a durable steel frame and premium components designed for high-traffic environments. 

Q9: Does it provide smooth and controlled motion?
A: Yes, dual pivot arms and precision bearings ensure smooth, controlled movement throughout both exercise paths.

Maintenance Tips

• Daily cleaning: Wipe swiveling handles, pads, and frame to remove sweat and keep upholstery in good condition.
• Inspect dual-pivot arms: Ensure both exercise arms move smoothly through all ROM positions with no sticking, uneven resistance, or noise.
• Check cable & weight stack: Look for fraying, slack, or misalignment in the 310 lb Silent Steel stack—replace or service immediately if worn.
• Lubricate guide rods: Apply silicone/PTFE lubricant regularly for smooth, quiet vertical movement of the stack.
• Tighten frame bolts: Periodically inspect all hardware—this ~649 lb commercial unit must remain rigid under heavy use.
• Inspect rotating grips: Ensure FLIP-N-GRIP handles rotate freely and lock securely for both pec fly and rear delt positions.
• Seat adjustment system: Verify all 7 seat positions lock firmly and slide without resistance for proper alignment.
• General safety check: Confirm smooth motion across both exercises and no abnormal noise or vibration during operation.