In reply to planetmarshall:
I live in the South Lakes, but when I've wanted to get a lot of climbing in, (when regularly doing fell races / mountain marathons,) I did a lot of training in the Howgills - lots of opportunity to go up one ridge, drop to the valley, go up another and repeat.
In terms of the Lakes a favourite run of mine, (for height gain,) was up Striding Edge to Helvellyn summit, across Nethermost Pike and Dollywaggon Pike, straight down the old fence / wall line and up to the summit of Seat Sandal, (almost due south,) down and up Fairfeild, go from the summit of Fairfield towards Hart Crag but before you get there go down Link Cove, go around Greenhow End and back up to Deepdale Hawse, over St Sunday Crag and back down to the road.
Post edited at 16:40