Seeing as you’re in Cumbria, find a nice scenic hill / fell.
One mile slow warm up jog beforehand, then ten one minute sprints up the hill / walk down.
Repeat ten times and warm down with a slow one mile jog on the way home.
Much better than doing HIT in the gym
I’d normally agree however we’re just awaiting wintery weather so I’ll pass! Warm gym with a bike and lots of women in tight gym leggings.