日語 Japanese Ask Questions Thread2 質問

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Japanese - Ask questions thread
http://dis.4chan.org/read/lang/1174719097/l50

New Anon in this thread here.

In sports warm-ups say in schools or a club, when counting 1-10, how come seven has a weird voiceless format?

shich(i)?

why wouldn't the first 'i' [sh(i)chi] be voiceless instead?

Also, I've just started in the Kendo club at my college. "Ha" and "to" are shouted when practicing forward swings in reps of two, what does 'ha' and 'to' actually mean?

Thank you.