Reading this thread prompted me to open a book I had obtained secondhand several years ago in Hay-on Wye in the UK called "Great Action Photography" published in the early 80s. It is a series of photos and interviews with action photographers.Most were using Nikon with one Nikon to Canon convert. Interestingly two of the German photographers were using Pentax 67s.
Originally Posted by Paul Sorensen
I have only seen a Pentax 67 on a photographic shop shelf and never handled it but it did look a monster in comparison with 35mm but clearly it must be manageable for handheld action shots. These were photographers who actually chose to use a 67 as opposed to 35mm. Of course wandering around all day with one slung round your neck may be something else again but it just struck me that a tripod may not be essential.
Incidentally for those based in the UK and interested in photography books both new and secondhand it makes a good day trip. Scenery near by in the Wye valley isn't bad either.