Female friend touches abs?

My female friend saw me shirtless for the first time on a trip to the lake with some of our other friends and she kept touching or poking my abs. She hasn’t expressed romantic interest or flirted much except for this. I have a pretty well defined six pack and not long after I took my shirt off she asked if she could feel them. Then occasionally she’d randomly poke my abs until we left the lake. Was this just innocent flirting or was this her way of expressing interest?
Female friend touches abs?
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