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Hammer Strength Ground Base® Jammer

GB-J

Built for raw power and explosive performance, the Hammer Strength Ground Base® Jammer is the real deal—no imitations, no compromises. While racks try (and fail) to mimic its movement, only the Jammer delivers the perfect blend of converging and diverging motion, unlocking true athletic drive.

 Key  Features

Converging/diverging arms

The key to the Jammer’s unmatched power transfer lies in its converging and diverging arm path. Unlike rigid, linear pressing arms, this design follows the body’s natural movement patterns, delivering a more athletic, explosive, and functional pressing motion that translates directly to sport and strength performance.

Ergonomic handles

The Jammer’s angled, ergonomic handles provide a natural and powerful grip position, reducing wrist strain and maximising force output. Whether driving through a press or loading up for explosive reps, the handles put the athlete in total control—allowing for optimal leverage and peak performance.

Band pegs

Take your power development to the next level. The built-in band pegs allow athletes to add accommodating resistance, increasing tension through the full range of motion and reinforcing explosive strength at the top of each rep. Perfect for athletes who need speed, power, and controlled force production.

 Built  for  explosive  power

Athletes don’t just lift—they drive, push, and explode. The Ground Base® Jammer trains force production in the most athletic way possible, mimicking the powerful pressing movements seen in sport. Whether it's linemen battling in the trenches or sprinters driving out of the blocks, the Jammer builds the kind of strength that translates to real performance.

 Unmatched  since  the  ‘90s

The Ground Base® Jammer isn’t new—it’s legendary. While other companies try to replicate its movement with half-measures, only Hammer Strength delivers the true Jammer experience. Designed in the mid-90s and still dominating weight rooms today, it remains the ultimate training tool for explosive strength.

Specifications
Product CodeGB-J
Dimensions (L x W x H)66" x 79" x 83" (167 cm x 202 cm x 212 cm)
Weight370 lbs (168 kg)
Standard Weight Horns6
Starting Resistance8 lbs (3.6 kg) per arm
Max Load Capacity4 x 45 lbs (4 x 20kg) plates per arm
Recommended Plate Mix4 x 45 lbs plates, 4 x 25 lbs plates, 4 x 10 lbs plates

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 Related  Products

Hammer Strength Ground Base® Jammer