WHY EXERCISE?

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Across
  1. 4. Risky, dangerous, with the nature of a hazard
  2. 5. Of an object, rigid, hard to bend, inflexible
  3. 6. In character; moderate; realistic; serious
  4. 7. One from whom a person is descended
Down
  1. 1. Free from pain; without pain or trouble
  2. 2. An attitude or point of view
  3. 3. The condition of being pregnant
  4. 8. Without giving notice, or without the usual forms; suddenly.