Ze wrote:If you are really at or under 5 % (unlikely), the hormonal effect will have a negative impact on your performance. Or you are taking some good drugs, and will be okay.
The lower boundry where hormonal disruptions is really dictated by gender and genetics. Men can get by with less then women. Some men may have negative affects at higher body fat concentrations then ohers.
Myself, I have had about 5% bodyfat for almost my entire life ( see profile picture if you on't believe it, which was taken after a 6 week layoff due to knee injury which was a result o an impact injury). In gener al Idon't get sick, injuried or cold or other telltale symptoms of being underweight.not recommending hat level to anyone. And with multiple test metrics its always come back the same. My advise is forget about weight, body fat,.... And just go out and train and climb, and have fun.