Also means
tighten; hitch up
Usage Note
anspannen in a body context means to deliberately tense or contract a muscle: die Bauchmuskeln anspannen (to tense the abdominal muscles). Contrast with entspannen (to relax). Also used figuratively for mental concentration.
Examples
"Beim Planken muss man die Rumpfmuskulatur fest anspannen."
Natural Translation
When doing a plank you have to tense the core muscles firmly.
Literal Translation
When-the planking must one the trunk-musculature firmly tense.

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