When my heartbeat goes up and I'm breathing harder, my nose becomes stuffed; making it difficult to breathe through the nose. The first couple of times this happened, I didn't want to stop and find a tissue. By the end of the w/o, my ears were clogged and took forever to pop. I've also noticed that when I jog/walk my thighs get itchy. I haven't noticed that yet with Cathe's low impact step. Maybe I will later with the more advanced dvds. Is this my lymph system flushing out (toxins?) or could it be allergies? I don't take any preventative medicines for allergies. Although, I frequently take Sudafed Sinus (the good stuff from the pharmacy). I'm wondering if I should take a couple Sudafeds prior to exercising. Anyone else experience this?