I'm an endurance runner. This journal tracks my performance since the addition of HIIT circuits and spinning to my training. Always keep pushing. You will never know your limits unless you go looking for them.
Kinley LITE Theme on HIIT & Run
Box crunches, oh how they burn!! I went looking for a video to share that demonstrates them, but I was fairly unsuccessful finding one. Maybe they are called something different.
I do them on my kitchen counter and extend my legs out until they are straight (and much faster than this guy). I did sets last night until muscle failure and am feeling it today for sure. They are a great variation to the ho-hum core exercises.
Do you have a secret weapon exercise for targeting the core?