Stewart,
Depends on the individual fish. Some leap a lot,some run a lot,some do a bit of both,some bore around at short distance but don't run much at all. The hardest fight I had this year was a 20 1/4" Don trout,caught while feeding on Olive Uprights which went 3lb 1oz (yes I know I said the lightest 20" Trout we had caught was 3lb 2oz but that was before looking in my records,in fact my mate caught one at Alford which was 2lb 15oz a few years ago). It shot off instantly to the other side of the river which had a good flow in this part,I got it fairly close quite quickly but I bet it took me 5mins to land it,despite piling on pressure it just would not come in. It jumped quite a few times too. My arm was aching when I landed it-many of these fish are pure muscle!
Richard