What happens next in this paragraph?

How to flex
Make a fist.
Keep your shoulders down and relaxed, but allow your shoulder blades to spread to keep your back wide. Form a fist with the arm you want to flex.
Available options: --Take two thumbscrews on each hand, one for each hand. The hand you use to flex should be able to only hold holding your wrist up, flat and straight.. --Start in the center of the circle and bring your right fist together to form a fist. Continue to roll your fist inward, bringing your arm down to form a fist with your fist.. --Curl your fist, then bend your palm. This movement is called mussing-up.. --The simple action of forming a fist already begins to tighten your muscles. It's impossible to fully flex your arms if you don't make a fist first..
The simple action of forming a fist already begins to tighten your muscles. It's impossible to fully flex your arms if you don't make a fist first.