1. Do you have difficulty climbing up and down stairs?
For example, you have difficulty pushing through one leg to go up the stairs or it hurts your knee when you go down stairs.

2. Do your movements feel heavy, as if someone turned up the gravity?
For example, you feel like you are moving through molasses.  When you feel tense in your gut and tight in your back, you realize that you are lethargic.  When you are relaxed, you feel much lighter when you move.

3. Do you have slower movements and a slower response time?
For example, you know you move more slowly than you used to, and you can't catch a fastball or return a serve as you once did.

4. Is it difficult for you to walk forward and backward so slowly that it takes 10 seconds to complete one step?
For example, you feel hesitant walking forward slowly and insecure walking backward.  You might find it hard to move from one foot to the other very slowly because of difficulties balancing.  Even following your partner's lead, dancing backward makes you feel uncertain.