Bikes on which you recline rather than sit upright are recumbent. Recumbent means leaning back in a reclining position.

Recumbent starts like recline, which is an easy way to remember it. Your dad's position in his favorite La-Z-Boy reclining chair? Recumbent. Your position when you lay back on lounge chair at the pool? Also recumbent — and in both cases, these are both positions of comfort.

Definitions of recumbent
  1. adjective
    lying down; in a position of comfort or rest
    synonyms: accumbent, decumbent
    not upright in position or posture
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