Waggle?
hitting a ball back and forth over a net
hitting a ball back and forth over a net
Passing in soccer or basketball...I think
you've got to "ding the ding dong" by hitting "it" back and forth.
Moving back and forth in time is called time travel.
when a river winds back and forth, it is called meandering
Reciprocating.
Assuming you mean back and forth from sideline to sideline or baseline to baseline, that would be called a suicide.
Because the river want to turn 180 degree.
Vibrations
Strokes.
Pace.