The Workout On road or the track, run a fast 1km interval at 10K pace, rest for 90 seconds, then run a 2km interval at half-marathon pace. Rest for 90 seconds, and repeat the set twice. "This is a hard session, but is excellent for speed endurance," says
P20 Once A Day (£18.45 for 200ml from chemistdirect.co.uk). If you have fair skin or a family history of melanoma, consider sun protective clothing and avoid midday runs. You should also have a coffee before you go, advise dermatologists from
