Four By Four

I'm often asked for turbo sessions so I thought I'd detail one of my favourites - the Four By Four. If I had to choose just one session it'd be this one. It's a total of 25 minutes plus warmup, but it can be so hard I have to get a friend in for moral support.

Simply put:

• Warm up (I usually take about 15 minutes, with some bursts)
• 4 minutes on
• 3 minutes off (some people take 4 but I find it's too much)
• Repeat for a total of 4