Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to strengthen your core [title] Engage your transversus abdominis during every workout. [step] In order to get the most out of your core-strengthening regimen, take a moment to find the transversus abdominis (your deepest core muscle). Once you've found it, you'll want to keep that muscle contracted and tight throughout the course of your workout.

Ending1: [substeps] Force yourself to take a deep cough. You should feel a muscle in your abs contract, which is the transversus abdominis. Ending2: Try not to tense up or overexert yourself during each workout, however, or your core will not function properly. Do as many kicks, jump ropes, and/or wall pushups as you can during your workout. Ending3: Also decide if you're experienced enough to incorporate transversus abdominis regularly into your routine. [substeps] Keep your ab muscles tight even after you've had time to devote to the core workout, to avoid injury. Ending4: [substeps] Your transversus abdominis, like your core, is not working from one side of your body. You're working from the other side of your body.

Answer format: ending1/ending2/ending3/ending4