One of the toughest ascents in the Peak District can be found just by Ladybower Reservoir in the Dark Peak area of the Peak District National Park.
Parkin Clough leads up to Win Hill, a total ascent of some 300m in little over one Kilometer. The path, such that it is, is the old boundary wall running up the side of the stream which tumbles down the hillside. Parkin Clough is a narrow V shaped gorge cut by the stream, with steep sides, you would not want to slip down. It is very slippery under foot in wet weather as you are walking along what remains of the wall, with some high stepping required in places to get the thighs and calfs burning.
The climb up Parkin Clough is something of a test piece for fitness, the test being to make it to the top in the shortest time, the quickest I have heard of is 12 minutes unladen and a little over 15 minutes with full hill kit. The test for lesser mortals is to make it to the top without stopping. Ascending to the summit begins at the foot of Parkin Clough by the Peak and Northern Footpath Society signpost and ends when the hand touches the thoughtfully placed triangulation pillar on the top of Win Hill. The views across to the Upper Derwent Valley and along the skyline to Kinder Scout and Bleaklow make the effort worthwhile.
The climb appears in Walk 9 of Dark Peak Walks