In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D".
Q: [header] How to teach yourself gymnastics [title] Make sure you're physically prepared. [step] Before you start flipping, pirouetting and standing on your head, you should work to reach a base level of physical conditioning. Build your muscular strength by performing calisthenics exercises such as push ups, pull ups, air squats and crunches. <sep> (A) [substeps] Incorporate strength training into the class to build your strength in a safe, stable, controlled way, the first step to becoming stronger is correctly completing a handstand. [title] Provide support in straddle splits. (B) [title] Familiarize yourself with stage-jumping and performing everyday gymnastics moves. [step] While jumping can be a fun part of gymnastics, even novice gymnasts often find that their body needs some extra support. (C) Go for a jog or swim laps a couple times a week to get in better cardiovascular shape. Begin stretching thoroughly every day-flexibility plays a critical role in gymnastics. (D) Weigh yourself once a week to determine your ideal level of physical exercise. [title] Pick the right stance for performing your gymnastics move.
A:
C