The Calf Cup Set

This 2-in-1 versatile design functions as both a J-cup and an enclosed barbell chamber for maximum functionality, is optimized for standing calf raises to help you train with confidence and safely stimulate maximum calf growth, and offers quick and easy conversion so you can switch between a J-cup and a calf cup in seconds.

What is a Rack Attachment?

What rack attachments are

Rack attachments bolt or pin onto a power rack or squat stand to expand what it can do — J-cups and safety arms/straps (the essentials), plus dip bars, a landmine, a lat pulldown, weight-plate storage, roller J-cups, and more. They turn a rack into a whole gym.

Compatibility comes first

An attachment must match your rack’s upright size (2x2, 2x3, or 3x3) and hole pattern/hardware (e.g. 5/8-in vs 1-in holes, Westside spacing). Attachments are usually series-specific — a Monster Lite J-cup won’t fit an Echo upright — so confirm the fit before buying.

How it compares