If you want to increase your effectiveness as a communicator and as a speaker - regular exercise is a powerful ally.
Here are 3 reasons why:
1) It provides you with the energy necessary to keep peoples attention.
2) When you feel good, and you look good your self-confidence increases. That confidence is channeled into how you carry yourself when you speak.
3) By your physical appearance and your energy, you amplify the overall message that you are sending your audience at the subconscious level through a phenomenon called signaling. One of those messages is your values.