can slow your finish time by several minutes, and heat or cold by even more. A survey of marathon finish times suggests that 12°C is the ideal temperature, a temperature of 0°C or 25°C adds seven per cent to your time, and if the day hits 30°C, you can

inspired the trend in 1954 with epic sessions like 10 x 200 metres followed by 50 x 400 metres – a combined 13.67 miles of speedwork. Ambitious runners the world over have aspired to that imposing standard ever since, in a quest for that elusive PB

– and it shows. When children draw stick figures, you’re the model. Just right Twice a week, spend about 30-45 minutes in the gym. Choose weight amounts that you can lift 10-12 times before fatiguing, and do a variety of exercises and stretches for upper

If you're running a marathon this spring, you're about to enter the most critical – and difficult – four weeks of training, when 1) your weekly mileage is at its peak; 2) your motivation may be flagging; and 3) you're most likely to get sidelined