Like I said in my Last post, I said I'd be putting us through on how to do the pike pushup. But it occurred to me that I let the pros do the guiding for I am but a learner too. So please learn from the instructions from SWORTKIT.
Instructions
Start off at the top of a pushup position on the floor, with your arms straight and your hands should be shoulder-width apart. Then lift your hips and walk your feet in closer to your hands so that your body forms an upside down V. Your legs and arms should stay as straight as possible.
From here, bend your elbows and lower your upper body down and forwards, until the top of your head nearly touches the floor. Your head should be infront of your hands once your elbows bend. Imagine, your hands are the bottom two points of a triangle, and your head moves forward as you lower down to make the top point of the triangle.
From the bottom position, push down into the floor hard with your hands and keep your elbows in close to your body to straighten your arms and return to the start position. Make sure that as you push your body upwards, you maintain the angle at your hips rather than pressing your chest away from the floor and collapsing at the hips.
Reference