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Re:Good sleep, good learning, good life (2012) by howox on Wednesday October 17, 2018 @03:40PM (#18242951)
Abs: sit ups. Too easy? Hold something heavy against your chest. Too easy? Hold something heavier.

Fault! This is adding weight. Better luck next time. :)

Re:Good sleep, good learning, good life (2012) by chrishynes on Wednesday October 17, 2018 @09:45PM (#18245316)
Hanging leg raises are what you're looking for. Start with bent leg, then straight leg, then toes to bar etc.
Re:Good sleep, good learning, good life (2012) by quickthrower2 on Wednesday October 17, 2018 @04:44PM (#18243628)
Pilates (wothout reformer) offers harder ab exercises without external weights