Historical clue formulations

• Dumbbell curls build them, for short — 2021-12-16
• Muscles used in pull-ups, informally — 2019-11-25
• Twice, musically — 2018-02-02
• Arm muscles, in bodybuilding lingo — 2017-02-03
• "Encore!" — 2014-12-05
• "Encore!," to a diva — 2013-06-28
• Twice, in music — 2012-07-30
• Ones not entirely gay or straight — 2012-01-30
• Again, in music — 2006-07-27
• Twice — 2002-08-01
• Twice, in music — 2002-01-13
• Recital hall shout — 2001-02-09
• "Encore!" — 1995-05-28
• "Encore!" — 1995-02-03
• Twice: Lat. — 1994-11-01