S1T1A1I1R1S1T1E1P3
11 points
STAIRSTEP is validvalid
[v STAIRSTEPPED, STAIRSTEPPING, STAIRSTEPS]
to carry out an exercise like stepping on a stair [v STAIRSTEPPED, STAIRSTEPPING, STAIRSTEPS]
[v STAIRSTEPPED, STAIRSTEPPING, STAIRSTEPS]
to carry out an exercise like stepping on a stair [v STAIRSTEPPED, STAIRSTEPPING, STAIRSTEPS]