Floor space for pushups and the willingness to try them. A computer with input device to draw a line and a connection to the internet to access this page.
Do pushups until your arms are tired then draw a line on the canvas. Your line ends when it touches a previous line, when your finger releases the input device, or when your line reaches a border of the canvas. Your end point will be automatically marked with a red X. EMPHASIS: IT DOESN'T MATTER HOW MANY PUSHUPS YOU DO, IT MATTERS HOW WELL YOU DO THEM. ONE PERFECT PUSHUP IS BETTER THAN 10 JUNKY ONES. KNEELING PUSHUPS COUNT.
Take a picture of today's addition to your wall drawing.