The SportsArt DF-305 isolates biceps and triceps in a single Performance Series machine — two opposing arm movements that belong together. A direct drive dual-cam system delivers precise resistance for both curls and extensions, a heavy-duty arm pad with chest support locks the upper body in position, and fully adjustable seat back and bottom accommodate every user height.
Function 2-In-1 | Weight Stack 220 lb | Bicep Start 11 lb | Tricep Start 6.5 lb | Capacity 500 lb |
The DF-305 trains the two primary arm muscles in a single station — bicep curl for the front of the arm and tricep extension for the back. Training them together on one machine ensures balanced arm development, prevents the elbow joint imbalances that come from training one without the other, and eliminates the need for two separate arm isolation machines.
Two opposing cams — one for the bicep curl arc, one for the tricep extension arc — deliver precise, consistent resistance throughout the full range of motion for both exercises with minimal cable slack. The direct drive design also accelerates changeover between movements, keeping workouts efficient and reducing waiting time on busy facility floors.
A heavy-duty arm pad braces the upper arm in position throughout both curl and extension movements — preventing shoulder momentum from assisting the lift and keeping the effort fully on the bicep or tricep. The integrated chest support further stabilizes the torso, isolating the arm muscles and maximizing the effectiveness of every rep.
Both the seat back and seat bottom adjust independently to position users of every height correctly at the arm pad — ensuring the elbow aligns with the machine's pivot axis for both curl and extension movements. Correct elbow alignment is essential for effective muscle isolation and protects the joint under heavy loads.
The 220 lb stack with 20 × 11 lb plates provides consistent progressive loading across the full range of both exercises. Starting weights differ by movement — 11 lb for bicep curl and 6.5 lb for tricep extension — reflecting the natural strength difference between these muscles and allowing users to begin each exercise at the correct starting load.
Weight Stack 220 lb (20 × 11 lb) | Starting Weights Bicep 11 lb / Tricep 6.5 lb | Max User Weight 500 lb |
Drive System Direct Drive Dual-Cam | Unit Weight 485 lb | Dimensions 54.5" L × 41.6" W × 57" H |
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