Drive your hips back making sure your weight is going through your heels NOT your toes. Feet should be shoulder width apart with toes pointing slightly outwards. Breathe in as you lower, out as you push up.
Keep a straight back, chin up and take a good stride forward. Lower yourself until both your knees have a right-angle bend in them. Push back off the front foot until you are standing back where you started. your front knee should not stravel past your front toes. Breathe in as you lower, out as you push up.
Lie on your back with your knees bent, feet flat on the floor. Squeeze your glutes together and lift your hips off the floor. try to get a straight line from your knees, through your hips down to your shoulders. Breath out as you lift, in as you lower.