How cold is too cold?

How cold is too cold to do HIIT outside?

Today it is in the mid 40's (F) outside. I was plannin on bundling up and heading out but if is going to do more harm than good then........
 
Its never too cold.
In winter in the UK it can get to -5'C which is 23'F
And it wont stop me from running, Justt dress up warm.
 
Yea I used to Run winter track in NJ when I was in HS, we used to shovel the snow off the track in order to practice outside.

Never to cold, your body will adapt, but make sure you cover your ears and hands when it is extremely cold and wear a wool hat, do a good warm up and cool down
 
Dont go prolonging it for to long, you might suffer hardening of the bronchioles. WORST case scenario though..... like -50 c
 
As long

As long as it doesn't prevent you from doing a proper warm up and stretch, it's not going to be a problem.
 
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