u/Proud-Ear-497

Hey guys, I am a runner so I like to do some threshold or Vo2 Intervals etc...

And I like to just follow the plan so if I do a 10x 30"/30" I like to really just listen to my watch. My problem is here : I live in a hilly area near Paris so I usually just go to a cycling ring which is completely flat or I go on the home trainer but as soon as I go outside I struggle to do intervals because of all the descents and sometimes red lights etc...

So how do you manage to follow your intervals outside??