Here she is, the last monthly challenge of the summer! Mermaids are only appropriate. This move strengthens abs, obliques, and legs all at the same time! Save, pin, or print the calendar and complete throughout the month. Here’s how to mermaid: lay on your side, head on one arm. Lift legs slightly off floor and cross ankles. Lift and lower legs, keeping straight and together (using abdominal muscles) for time allotted. Then flip to the other side and repeat, working yourself up to one minute on each side! Stay strong, tight, and focus on the abs. Bring it on, August.