well, swimming is very rhythmic, and really not that hard with enough practice. Butterfly is, or was, my best event, coincidentally. As to archery, firstly, i don't believe in sights, and secondly, all you need is a strong left arm - no coordination about it. you just let go at the right moment, so it's more timing than anything else. And anyone who shoots with compound bows at all, or with any bow from before 40 ft, is a wimp.