when its really hot and humid would you? (Page 2)

OP - Also keep in mind the event you're training for.  If you expect it to be in the 90's and Humid, you may want to get a few sessions outdoors to make sure you hydrate correctly, understand how it will affect your run, etc. 

I am in the Southeast and travel around the country for work, so one day it could be beautiful for a morning run and others I may be in 95F/95%Humidity with poor air quality.  I prefer to run outside in the morning or in the evenings, just after a rain shower passes by is always great if you can.

The really important thing is to stay safe if you are not accustomed to running in that weather.  Hydrate and know the signs of heat injuries.

-William 

I wouldn't race indoors so why train there. That being said I have cut some runs short because of heat but try to adjust my pace accordingly to not have this happen. It's pretty much 78-100 degrees any given time of the day here and humidity is pretty high too. Only saving grace is a little afternoon seabreeze but a hot breeze isn't exactly comforting.

HTFU, get some salt sticks and a handheld, and run outside

depends on the day.  chose the former today.  generally I prefer to run outside, though.

This summer, the humidity has been worse at 5:30am than the heat at 5:30 pm.  Its been a summer to pick your poison from a training standpoint!

Couldn't agree more, though that seabreeze at least keeps the air moving. Nothing worse than either a) no wind moving at all, or b) a dry/hot land breeze.

I hate running in extreme heat and humidity. For me, a Swede living in Wisconsin, that's over 90°. I'll do it because it doesn't seem to harm me, but I sure don't enjoy it as much as I enjoy running when temps are in the 70s.

I would try to do your run outdoors, being careful to listen to your body's signs of overheating.

If you have a choice of times to train, it might help to experiment. I've noticed that even at the hottest/stickiest times here, there's a "sweet spot" in the morning when the night-time humidity has lessened but that sun's not too high so the heat seems more bearable. It's not as early as one might think--maybe 6-7 AM, or 6:30 to 7: 30 in winter. It's proceeded by a nasty 30-60 minute window when the pavement can literally steam while the previous day's precipitation/dew evaporates.  Evenings have higher temps but noticably lower humidity.

I'm sure it differs depending on climate or location but if you have a choice, you could experiment/ check daily weather data and find the best time for you.

i only run outside.  i try to make half my runs in the AM and the other half in the heat and sun.  if the heat is getting to you slow down.  it takes time to get used to it.  don't expect to be able to go out at the same pace/duration as you would in cooler weather.  as you get acclimated you will see your heat runs speed up to what you are used. 

i tried to find a reference link that i read a while back that stated that gettin heat acclimated can increase blood volume by up to 27% since you have more flow into your capillaries to try and cool your body when training in the higher temperatures.  when you switch to cooler temps the increased blood volume allows for higher oxygen supply to your muscles, resulting in a performance boost.

x2; NEVER the dread mill!!  Been reefing futbol games last 3 weeks-103++.  Might get an occasional breeze (drop the temps down to 100!!)

It's YOUR workout, do what YOU feel is better training.  If the run needs to be a tempo run or faster and you feel the heat will have a negative impact on that, then treadmill it.  If it's a long run where you just to run X minutes etc. then maybe you go for it outside.

The nice thing about the treadmill is that you can keep a consistent pace.  Sometimes the workout is actually more beneficial on the 'mill.  Heat can take away from a high quality workout.

My goal for 2012 is not use the treadmill at all.... I enjoy the outdoors.  Yep, I'm in Ohio and the humidity was 84% today, but I just go slower and carry water to make up for the heat and humidity.