focus on the intervals for the day. Make those as high quality as you can.
The rest of the ride is warm up, recovery, and cool down.
If it's a hard interval workout, and you still feel like riding hard when the interval work is done, you didn't do the intervals hard enough.
At most fill the balance of the time riding at an endurance pace.
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You could fall off a cliff and die.
You could get lost and die.
You could hit a tree and die.
OR YOU COULD STAY HOME AND FALL OFF THE COUCH AND DIE.