A mobility device comprising: a main frame having a central longitudinal axis which coincides with the median plane of the mobility device, a body support system comprising: an elongated body support member which has a central longitudinal axis that is contained in a median plane of the mobility device, a first end portion of the body support member being pivotally connected to the main frame via a medial pivot connection, and a seat arranged on the body support member; an elongated rotation transfer member configured to rotate relative to the body support member, and extending through the body support member in a second end portion of the body support member, wherein the rotation transfer member has a central longitudinal axis which extends transversally relative to the central longitudinal axis of the body support member, and wherein the rotation transfer member has a medial rotational connection with the medial pivot connection, a backrest, a first lateral motion transfer member (31; 31') fixedly connected to the rotation transfer member at a first lateral end thereof, and a second lateral motion transfer member (33; 33') fixedly connected to the rotation transfer member at a second lateral end thereof, wherein the backrest is connected to the first lateral motion transfer member (31; 31') and to the second lateral motion transfer member (33; 33') such that rotational or pivot motion of the first lateral motion transfer member (31; 31') and the second lateral motion transfer member (33; 33') is transferred to the backrest, and a leg rest pivotally connected to the main frame via said medial pivot connection wherein the rotation transfer member has a rotation transfer connection with the leg rest, whereby rotational motion of the leg rest relative to the main frame causes rotation of the rotation transfer member providing corresponding rotational motion of the first lateral motion transfer member (31; 31') and the second lateral motion transfer member (33; 33'), wherein the body support member and the rotation transfer member have the shape of a T, with the body support member forming the base of the T and the rotation transfer member forming the top of the T. a main frame having a central longitudinal axis which coincides with the median plane of the mobility device, a body support system comprising: an elongated body support member which has a central longitudinal axis that is contained in a median plane of the mobility device, a first end portion of the body support member being pivotally connected to the main frame via a medial pivot connection, and a seat arranged on the body support member; an elongated body support member which has a central longitudinal axis that is contained in a median plane of the mobility device, a first end portion of the body support member being pivotally connected to the main frame via a medial pivot connection, and a seat arranged on the body support member; an elongated rotation transfer member configured to rotate relative to the body support member, and extending through the body support member in a second end portion of the body support member, wherein the rotation transfer member has a central longitudinal axis which extends transversally relative to the central longitudinal axis of the body support member, and wherein the rotation transfer member has a medial rotational connection with the medial pivot connection, a backrest, a first lateral motion transfer member (31; 31') fixedly connected to the rotation transfer member at a first lateral end thereof, and a second lateral motion transfer member (33; 33') fixedly connected to the rotation transfer member at a second lateral end thereof, wherein the backrest is connected to the first lateral motion transfer member (31; 31') and to the second lateral motion transfer member (33; 33') such that rotational or pivot motion of the first lateral motion transfer member (31; 31') and the second lateral motion transfer member (33; 33') is transferred to the backrest, and a leg rest pivotally connected to the main frame via said medial pivot connection wherein the rotation transfer member has a rotation transfer connection with the leg rest, whereby rotational motion of the leg rest relative to the main frame causes rotation of the rotation transfer member providing corresponding rotational motion of the first lateral motion transfer member (31; 31') and the second lateral motion transfer member (33; 33'), wherein the body support member and the rotation transfer member have the shape of a T, with the body support member forming the base of the T and the rotation transfer member forming the top of the T.