Historical clue formulations

• Leg-building exercises — 2014-10-13
• Leg-building set — 2011-02-04
• Weightlifting set — 2009-04-24
• Occupies an abandoned building — 2008-09-18
• Crouches — 2005-11-07
• Weightlifting exercises — 2004-05-07
• Some calisthenics — 1998-02-08
• Part of a weight lifter's routine — 1995-11-25