Fig. 1

Illustration of the lifting protocol. a Lift from floor to table with forearm length (horizontal distance of the load center to the body) – starting position. b Lift from floor to table with forearm length – end position. c Lift from table to table with forearm length – starting position. d Lift from table to table with forearm length – end position. e Lift from floor to table with ¾ forearm length (horizontal distance of the load center to the body) – starting position. f Lift from floor to table with ¾ forearm length – end position. g Lift from table to table with ¾ forearm length – starting position. h Lift from table to table with ¾ forearm length – end position. i Lift from floor to table with rotation of the trunk – starting position. j Lift from floor to table with rotation of the trunk – end position. k Lift from table to table with rotation of the trunk – starting position. l Lift from table to table with rotation of the trunk – end position. See methods section for more details