on bringing your breathing down lower, into your belly. This will also help oxygenate your blood. Raise your arm on the side that is cramping and gently stretch it as you run. If the pain keeps getting worse, slow down to a walk until it start to subside. This has been the most effective for us, and anecdotally, it seems to work best for others as well. 2. Another technique which you may already be doing instinctively is to press your hand into the place where it hurts . Generally this involves pushing your fingers or the palm of your hand slightly under you ribs and inward toward your centre. Not only can this help by passively stretching your diaphragm, but it may help stabilise your innards, if all that bouncing around is indeed the cause. 3. Change up your breathing . This piggybacks on #1. If you are always exhaling when you land with your right foot, that could be wearing on you unevenly. Try breathing every third (or fifth) step, which will alternate the side you breathe on and will also help you slow things down a little. While you're at it, try taking smaller, smoother steps, with less bouncing. You don't have to slow down, you just have to quicken your cadence . 4. Eat less before your run , or at least eat smarter. If you suspect that your full stomach is playing role in your cramping, look to eating more complex carbohydrates, which are primarily