More exercises!

I bet I'd lose a lot more weight if I exercised my body half as much as I did my mind, no?

From writing_101

Make us guess
Describe any object without telling the reader what it is. It could be anything from a drop of water to a planet in another universe. Let's see if the reader can guess what you're describing.

My Personal Sun

personal citric sun
roundly resting in palm upturned
fingernails dig at golden rind
pull, twist, unwrap

thumb thrust in
separating rays, segmenting
teeth tearing
moist bits of flesh

refreshing
thirst and hunger
in one tangy
bite

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So... What am I?