Estella Gong, who was self-conscious about her body and told by everyone that she was "scrawny", is proof you can accomplish a lot in just 100 days.
Watch the incredible changes that occur when Gong devoted herself to 100 days of pushups in the time-lapse video above from Give it 100, a website devoted to self-improvement through video documentation created by Karen Cheng.
Cheng documented her own progress in dance over a year in 2013.
Then, if you find yourself inspired after watching, try a few pushups yourself. Here's a handy reference for proper pushup form to help get you started.