Re: Seiza and Calves Pain
I presume you have never done any seiza prior to aikido; don't be too hard on your lower limbs. Sit in seiza and alternate between cross leg sitting and seiza whenever either sitting position becomes uncomfortable. When your body becomes used to this way of sitting it will be able to tolerate longer. Maybe one day, you may have forgotten you are sitting in seiza and may be likely to sit in seiza throughout your aikido session without you realizing it.