IM pretty sure this might be PFS related.
Pre-pfs Id wake up with a lot of energy and i would go for a run for about 40 minutes no problem. but over the last few months I get tired after like 10-15 minutes which is really not like me. My fitness is great it just feels like my energy and vitality has died.
I admit I haven't done the juice feast yet as I'm not mentally prepared. It just feels it would be really hard especially with my training.
I have been working out and doing some herb rotations. And sometimes other supplements like zinc, creatine and l-arginine