People commonly do this exercise with a cable machine, but you can do it without one as long as you have a band and bar where you can hang it.
Double the band over the bar so that there are two handles for each hand. Grab the bands with a double underhand grip about shoulder-width apart.
Then think of it like a standing crunch. Round your back, contracting your anterior core and rolling your elbows past your midline. Doing it in a standing position carries over to more of your lifts.
Do 4 sets of 25-30 reps once or twice per week. Training the core with resistance has a huge carryover to your deadlift and will protect your lumbar when you're using maximal weights.
Why do so many lifters follow programs that fail to fit any of their equipment needs, exercise issues, volume or intensity issues, or personality? Dan John calls it the "Cinderella's Stepsister Syndrome." In other words, the shoe don't fit! Here's how to find the right shoe for you. Hopefully, it doesn't have a 6-inch clear plastic heel, you tramp, you.
Lately there's been much discussion about whether it's more beneficial to do total body training (TBT) or some version of a split system where parts of the body are separated for different workouts.