Bach Sonata No. I
I'm playing Bach's Sonata No. 1 (Adagio and Fugue) for my AMEB LMUSA exam in a few months. Do you have any tips for building up enough stamina to play both movements consecutively? I feel completely exhausted after playing both (or even just the Fugue) and I still have to play 3 other pieces for the exam...
You should not feel exhausted after the playing the Adagio. If you do something is wrong, at least in my opinion.
Is it mental or physical exhaustion? Have you asked your teacher for advice?
It's not necessarily tension, it may simply be a case of building endurance. At the level you're playing at your teacher would probably spot any potential tension problems.
Definitely sounds like a tension issue more than a strength/endurance issue.
I've played the whole fugue off the string from time to time. Not in concerts, just for myself. I think it sounds pretty cool that way.
Maybe your motions are just too big. When playing rapid fast notes, try to keep your motions as small as possible. Has your teacher given you any advice? Have you asked?
How's your cardio? I know it may sound farfetched, but a consistent exercise regimen can help with focus and physical relaxation in other situations. If you aren't running or biking or doing yoga or something, consider taking something up in a moderate way. Sleep is also really important.