Exertion's End

[RiverNotch]

The dulcet waves met my ears at a distance, at or from? And "dulcet waves" is truly quite sweet.
rising in soft crescendo as our bikes approached the sea
on a root strewn path.

We chose the toughest route, testing the tires, Somehow, the narrative arrangement feels off: isn't the root strewn path already the toughest route? I'd support changing the tense here: "We'd chosen..."
attacking the pedals, and embracing the anguish Try removing "and".
in a bellicose frenzy up the bosky incline. Though not a style I often favor, the sonics do make up for the wordiness.

My eyes stung with sweat This line reads somewhat too passive -- I'd prefer "Sweat stung my eyes". And the movement to this image feels somewhat artificial: were you not getting sweaty already, having chosen the "toughest route"? And either way, somehow this feels like the direct continuation of the last stanza's sentence, so that "bosky incline" should end with a comma, not a period.
as we began the breakneck descent 
down the hills rear end. hill's. And I'm not sure "rear end" is the best choice here....*farts*....oh, excuse me.

When we burst from the trees, the salt air kissed my lungs, Trying removing the comma at the end.
and the ocean cold made us squeal Squeal reminds me too much of either rats or teenage girls.
before a tired quiet fell upon us, Try removing the comma.
and we heard the ocean speak.
Lovely work.