Get a senior teacher, preferably with iyengar training, to asesss( proper,good,healthy,symmetrical,evenly distributed,balanced) alignment and placement of hands in say… downward-dog.
I did about, at least, 300 hours of home practice before mine were swiftly and immediately corrected when i arrived at a fancy studio.
They should be webbed, like duck’s feet,and pointing straight ahead.( i’ve since been practiciinsg this way since , and still find it very difficult to master placement, like in say down-dog) fingers spread out, with one’s weight evenly distributed throughout the whole hand. Rather than cupped, and placed to one side,typically inwards like in mycase…The whole, palm-side ,of the hand should bear the weight,fingers splayed ,evenly spaced.And like Willem suggests as much on the knuckles as the rear/heel and sppread throughout the sides. This will likely take me yeears to master and i find it very challeneging.
Placement of hands will, in turn, affect, rotation of fore-arms,and shoulder joint,and continuing with muscles activated along the spine, and so on… and so on…going all the way down to the feet.-say in DD, or even chataranga dandasana,cobra,upward-dog etc.
The way i suggest you do it here is the way i practice it and this particular teacher. he taught a yoga with an iyengar level of attention to precision in terms of proper placing and alignment(incdentally he coupled this with a freeform or free-style vinyasa, in terms of flow and pace).There may be other schools that teach it differently.But this way means your weight is evenly balanced and distributed, form symmetrical,and leading forward.
You want safe integration of all body parts,actions,sensations,breath etc.
Also you sound pretty fit and healthy ,with no issues as such with an active lifestyle . Obviously that is easy to take for granted, if you’ve got it.
If your hand placment and alignment is not an issue, then you could slow down a little,take it real gentle and softand mindful with your asna practice. I know from personal experience the folly of complacency, or the eagerness to “progress” with your practice, perhaps before you’ve been [B]safely[/B] and patiently prepared.I know asana can be addictive but you’re morelikely to feel your hands, and allow the sensory-motor(sensation& movment) & parietal(proprioception) parts of you brain to sense and for you to listen to all the signals,and adjust accordingly.Focus inward, relaxing your body and your breath.
This may not “work”. So you could consider stopping the thing that is harming or yeilding no result.So get a senior teacher with technical alignment-based training, who can both observe,recognise poor form and would adjust, if he saw something wrong ,or suspect, in class.
Your hand placment ,say in DD, could be off, but this info. is absent here.
if your hand-lacment is fine then your might want to stop what you’re doing, if the numbness in your hands is disturbing you.
The only thing i can think of is pooor sensory -motor control, evidenced by involunatarily tight,hyper-tonic muscles. Poor Ciculation hardly seems likely,given your active lifestyle.
You may want to seriously consider consulting a doctor.And I don’t know enough about carpal tunnel syndrome to comment.
Remember- spread your weight evenly over the whole hand,front,back and sides,palm-side, fingers splayed and spread( does take some practice!!) I.e like duck’s feet, pointing straight ahead,(not to one side, and symmetrical -as best you can…Don’t force it-be gentle etc
Or do other poses, without weight-bearing. Or consult a doctor
I can tell when I am touching things, for instance stroking my hair, that the numbness is still there.