Now, some movements may seem strange at first but you'll get used to them. Don't give in to the temptation to hold your breath. Holding your breath, taking a big breath and holding it while you push or pull, can cause changes in blood pressure which can be a problem if you have heart disease. When doing any weight training remember always to avoid jerking or thrusting your weights. Use smooth, steady movement. Breathe out as you lift or push and breathe in as you relax.