Why is a zero gravity massage chair more comfortable?

Newest Rowing Machine

https://treadmillspinbike.com/pro.../fitness/rowing-machine/

Indoor Rowing Machine R23 Feature

Seven exercise modes: three main functions: rowing machine function, abdomen device function, waist twister function, and four secondary functions: sitting pull function, standing pull function, push-up function, and rope pull function.
parameter:
Material: carbon steel pipe, ABS, nylon, leather, MDF
Twisting/rowing mode area: 1350*610*648mm
The abdomen mode covers an area of 1297*610*1247mm
Package dimensions:
The measurement method is placed flat on the ground
Net weight: 19KG
Gross weight: 22KG
Carrying capacity: 120KG