MOUNTAIN RACES

1 The Alpe D’Huez Tri (2 August) features the titular Tour de France ascent and all its iconic switchback glory. There’s also a lake swim 700m above sea level and a high-altitude run. alpetriathlon.com

2 The Helvellyn Triathlon (2 Sep) has long been a classic on the circuit. It boasts one of tri’s toughest courses, with the 61.2km bike including the infamous ‘Struggle’ and a run up Helvellyn. trihard.co.uk

3 The Brutal Extreme Triathlons (15 Sep) in North Wales features a host of distances, including one of the toughest irondistance events on the globe. The run takes athletes up and down Mount Snowdon. brutalevents.co.uk

4 The Ben Nevis Braveheart Triathlon (15 Sep) features a 1.9km loch swim, a 90km bike and a run to the summit of Britain’s highest mountain. bravehearttri.com