[csydas]

Mindless 2¢ observation, you might need to review your intensity when exercising and scale it back a little until you find a better pace. This sounds like how my evening runs are after long breaks, and that's almost always due to me being over zealous and very bad at pacing. Once I correct it my evening exercise is very pleasant sans the mosquitoes.

It should be tiring you but the description you gave sounds like the intensity might be set a little too high at the moment. Scale back a little and build into it.