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Re:Ask HN: Low self confidence and self esteem. How to improve? by sprash on Monday May 20, 2019 @06:10AM (#19958886)
Indeed. I recommend weight lifting. Especially free weight exercises like squats and dead lift that are training mostly the biggest muscles have a very positive impact on confidence because they increase testosterone levels measurably.

Cardio had zero impact though, at least for me.

Re:Ask HN: Low self confidence and self esteem. How to improve? by Insanity on Monday May 20, 2019 @08:43AM (#19959773)
as another benefit, it makes you tired so you'll sleep better. At least that's one of the major benefits I've noticed. I always had trouble sleeping (which impacts my work). But when I started doing weights and making myself physically exhausted, sleep came easier which meant better work etc :)
Re:Ask HN: Low self confidence and self esteem. How to improve? by symfoniq on Monday May 20, 2019 @11:12AM (#19961150)
By 10:00 PM on squat and deadlift days, I couldn't stay awake if I wanted to. But I don't want to.