I wrote this story as a fantasy for someone specifically, and then decided to share.
Innocently he looked up from his walk just in time to see her disappear from view to anyone who might be watching from the sidewalk - should anyone be looking. He wasn't, or it least he wasn't until her movement caught his eye. She may have fallen. She may need help! It was his duty as a Good Samaritan to check on her, to make sure she was alright. At least that is the reason he gave to win the argument with himself.
He crept closer and as he peered through the window he could see her lying on her yoga mat, right knee up with her hand resting casually on it. Although she was alone and looking at no one, she had that look - you know, that look, the look that needs no further explanation but makes every man weak - yet at the same time eager to show their strength.
He ducked as she sat up and stared toward the window without seeing, emboldening him to take a step forward as she assumed the meditation pose. He was entranced with the beauty and sensuality she exuded for no one other than herself. She began her sun salutation routine as he watched; enjoying every pose. Finally at the end she relaxed into the meditation pose again.