Lattice Training Hand File

Stronger Forearms, Less Finger Strain

The Heavy Roller lets you build grip strength without hammering your finger tendons. By shifting the load into your palm, it focuses on your forearm flexors and wrist stabilisers — making it a great alternative or complement to hangboarding.

Train for Slopers

Slopers demand a special kind of open-hand power. The Heavy Roller mimics those same forearm and wrist movements, helping you train the right muscles off the wall while saving your skin for climbing.

How It Works

Wrap the cord around the roller, clip in some weight (we recommend the Lifting Pin), and lift. The offset load creates rotation, forcing you to grip tight and control the movement. Depending on how you move, you’ll hit either the wrist flexors (curling in) or extensors (curling out) for targeted, balanced training.

Benefits Beyond Strength

• Stability & Control – Engages small stabiliser muscles as you balance the load.

• Injury Prevention & Rehab – Helps “bulletproof” wrists against strain, and supports recovery from issues like tendonitis or wrist injuries through controlled loading.

• Skin-Friendly – Train sloper strength without trashing your fingertips.

Built for Comfort & Progression

Research showed that 60mm (2.4in) is the sweet spot for comfort and wrist health, so the Heavy Roller is sized to reduce awkward strain. Its powder-coated finish provides a secure grip, even in sweaty sessions, and the solid build is made to last. Pair it with a Lifting Pin and fractional plates for precise, incremental load adjustments.