The High School Musical starlet sported leggings and a happy skull design T-shirt for her exercise session on Thursday morning (20 March).
Ashley went make-up free and wore her blonde hair scraped back in a messy bun, proving she doesn't need oodles of red carpet make-up to make her look fab.
We've long been admirers of Ashley's casual off-duty style, which she recently said switches up all the time depending on her mood.
"Anything can happen!" she told Boohoo's StyleFix magazine. "I don't like to label my style as one specific thing because I am the type of person that expresses kind of daily how I feel so I can go from, you know, really boho to edgy rocker to like really laid back California style.
"There are really so many different things, I don't really stick to one style. I like to do my own thing."
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