General fitness very high resting heart rate 43

no body fat to speak of.

I seem to be fairly strong, forearms got quite visibly burly from all the climbing. I'd say my technique is slightly above average for someone climbing as long as I've been.

If anything I'd say I climb a bit like a boulderer

Even more so than a buddy I climb with who's technique I'd say isn't quite as good, is nowhere near as fit - he does climb a bit faster than me though.

Sounds to me like you need to use your arms less and learn to grip more lightly. Focus on your feet.
The top climbers (in general) are not tremendously burly (although they may be freaking strong).

Practice holding on as loosely as you can (expect to fall). Focus on using your legs to drive you, not your arms. Also, think about how you rest on holds to let yourself recover after moves.

So much bandwidth, so little value.

Jay

Seen some info about how caffeine can interfere with creatine, and I'd say for sure caffeine affects me a lot. If I go for a hard run or ride on my normal dosage I will have a much worse run/ride than if I just have a little, heart/blood pressure just going too hard.

So wonder if that could be it plus a lack of very specific endurance training, suggestions ? ;)

Once you're good and warmed up and you start feeling pumped, try stretching your forearms when you get a rest position. Stretching should help "thin" the muscles and thus reduce compression on the local blood vessels. It's not a magic fix, but it should help to some degree.

You're right. Climbing is easy and you should be much better by now. I mean, look at how fit you are.

Genetics. Must be.

I had the same problem, but then i tried using NO products and it helped tremendously. They allow me to climb harder and longer and recover faster, which seems to be what you're looking for.

Wow. You didn't even attempt to cover up the fact that you work for them. Good plug

So, the group has narrowed the OP's problem down to the following.

He is either overtraining or undertraining, or else he is genetically prone to fatigue, or his diet or sleep habits are wrong. Worse yet, his fatigue might be the result of psychosis, or simply psychosomatic; that is, he might only think he is tired. One possible manifestation of psychological distress is fear, which may be causing him to hold his breath.

If the problem is not genetic or psychological, it may be due to early development, either in the womb, or shortly after birth. Of course, developmental problems do not rule out genetic or psychological causes. Who knows, any two of these, or possibly all three, could be affecting his performance.

He may need more supplements, or fewer; his caffeine intake might be hurting his performance. Either that, or it's helping it, although we cannot rule out the possibility that it has no effect. Ditto for alcohol.

Warm ups are another area of concern: he may not be warming up sufficiently, or, worse yet, doing too many warm-ups, leading to fatigue. Similarly, the possibility that he is doing the right number of warm-ups, but at the wrong grade cannot be overlooked; however, whether his warm-up grade is too high or too low cannot be ascertained.

Overgripping is another possibility. His technique may be poor, his footwork sloppy, or he may be climbing too dynamically or too statically. Alternatively, his pacing may be off, although, based on limited data, we cannot say with confidence whether his pace is too fast or too slow, or if he is not finding good rests, or, possibly, finding rests, but not actually resting at the rests. Stretching at rests may reduce fatigue, but the evidence for this is limited and inconclusive. It can't hurt to try, but, you never know, it might anyway.

Jay

So, the group has narrowed the OP's problem down to the following.

He is either overtraining or undertraining, or else he is genetically prone to fatigue, or his diet or sleep habits are wrong. Worse yet, his fatigue might be the result of psychosis, or simply psychosomatic; that is, he might only think he is tired. One possible manifestation of psychological distress is fear, which may be causing him to hold his breath.

If the problem is not genetic or psychological, it may be due to early development, either in the womb, or shortly after birth. Of course, developmental problems do not rule out genetic or psychological causes. Who knows, any two of these, or possibly all three, could be affecting his performance.

He may need more supplements, or fewer; his caffeine intake might be hurting his performance. Either that, or it's helping it, although we cannot rule out the possibility that it has no effect. Ditto for alcohol.

Warm ups are another area of concern: he may not be warming up sufficiently, or, worse yet, doing too many warm-ups, leading to fatigue. Similarly, the possibility that he is doing the right number of warm-ups, but at the wrong grade cannot be overlooked; however, whether his warm-up grade is too high or too low cannot be ascertained.

Overgripping is another possibility. His technique may be poor, his footwork sloppy, or he may be climbing too dynamically or too statically. Alternatively, his pacing may be off, although, based on limited data, we cannot say with confidence whether his pace is too fast or too slow, or if he is not finding good rests, or, possibly, finding rests, but not actually resting at the rests. Stretching at rests may reduce fatigue, but the evidence for this is limited and inconclusive. It can't hurt to try, but, you never know, it might anyway.

Are you talking about stretching as an alternative to shaking out on a route, between routes, or both, or neither?

What specific stretches (and more generally stretching protocols) do you have in mind?