COMMA is a modular fitness equipment in the family scene.As a modular home fitness equipment, COMMA breaks the fixed relationship between the grip and counterweight of traditional fitness equipment (reset the configuration between the grips). The modular splicing design successfully improves the comfort and safety of novice users when using fitness. Multiple modules also enable novice users to train to any part. With a writable handle design, users can easily change the grip angle, improve wrist comfort and reduce the probability of injury for novices.