"An Excessive Heat Warning means that a prolonged period of
dangerously hot weather is expected, during which heat illnesses
are likely. Stay in an air-conditioned building and check up on
relatives and neighbors. Postpone any non-essential outdoor
activities planned during the midday and afternoon. If outdoor
activities are necessary, drink plenty of water, wear light and
loose fitting clothing, reduce strenuous activities, and take
frequent breaks. Anyone overcome by heat should be moved to a cool
and shaded location. Heat stroke is an emergency, call 9 1 1."
MTB cycling 30:00 
When I got home it was hot. So I decided to wait a bit. Mary called and we chatted on the phone. I told her it was hot. I checked the LJWorld front page and it said it was 100F. Yuck.
Around 7, I got out the door and rolled around on the bike paths. It did feel nice to move around.