Definition of "lifter"

While some lifters insist that supersets must consist of consecutive exercises for the same bodypart, others would bet their weight belts that supersets involve opposing bodyparts.

2010, Eric Velazquez, “Power Pairings”, in Reps!, 17:83

When he dismissed Keith Miller, caught at short leg off a lifter, I turned round to Tony Lock[.]

1990, Ashes: Battles and Bellylaughs, Byron Bay: Swan Publishing, page 148

Is he so young a man, and so old a lifter?

c. 1602, William Shakespeare, Troilus and Cressida, act 1, scene 2, line 118