Peanut shapes. Yeah. I know. Sounds ridiculous. But I've been looking at Youtube videos on drawing, and these seem fun. Of course I'll do them on paper, not on screen.
Matthew Archambault is an adjunct instructor at the School Of Visual Arts in New York and has his students do these peanut shapes in their first week at school. He considers it a great warm up as well as a shape that will help you draw figures later on. In this student's sketchbook video there are two or three pages filled with these shapes at about 6:14 into the video.
I'll be sure to let you know how I get on.