Helly Hansen L/S Stripe Crew (£30.00)Kerry says: There's a reason why this baselayer with the distinctive stripes down the arms has become one of Helly Hensen's best known and biggest-selling pieces of kit: it works. It's small and lightweight (you

loosely arrange at a 30-40 degree angle away form the body, like the wings of a plane.  Your feet should be hip width apart2. Inhale and, using your whole core: glutes, lower back, abdominals, breathe in lift your arms, legs off the floor as high as you

splayed for extra balance. Make sure you are tall through your spine and engaging your core.2. This next bit is the tricky bit. Raise your hands above your head, arms straight, then swing them down in front of your body and cross your left arm over your

you'll start your next run feeling that bit taller and stronger. It also works your core, toughening up your mid-section which, if done regularly, will help your running posture and keep you going for longer before you start to bend forward