An apparatus that supports a user in a variety of positions to comfortably perform tasks, such as applying one or more tattoos to skin of a subject is herein disclosed. The apparatus can be reconfigured to optimally position and support the arms and/or chest of the user. A method for using a stool can involve rotating armrests of the apparatus from a stowed position to a deployed position. The armrests can support the user's forearms while supporting the user's chest such that the user can comfortably perform tasks in front of a chest support of the stool.

A plank stand, comprising: a base; a first leg shaft connected, on a first end thereof, with the base; and at least one first leg support connected with a second end of the first leg shaft; wherein the plank stand is configured to enable a user to stand on the base and lean on the at least one first leg support.

A vertical pulldown machine includes: a support frame seated on a floor surface; a body frame connected to the support frame to form a support structure; a pair of weight units rotatably mounted on the body frame and mounted with a weight plate; a pair of rotating units rotatably mounted on the body frame and provided to rotate respectively at a preset distance apart; a pair of connection units provided to connect the weight unit and the rotating unit to transfer a load of the weight plate to the rotating unit and to enable length adjustment; a pair of grip units connected to one end of each of the pair of rotating units and providing a space for a user to grip; and a sitting unit connected to the support frame and disposed in front of the body frame to provide a seat unit for the user to sit.

Sitting and kneeling chair allowing quick and frequent transition between two core configurations, between at least sitting and kneeling positions with adjustability, without leaving the chair. Knee pads have inverting knee assembly with front and rear ends, that uses a knee pad pivot, follower, and knee linkage coupling with and upper portion of a frame below the seat assembly for travel between the upper portion of the frame and the lower portion of the frame above a base where each knee pad may be deployed from and between deployed and inverted orientations.