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Across 4. the ability to endure an unpleasant or difficult process 6. the quality of bending easily without breaking 8. doing something 10. how fast you do something 11. doing push ups makes you more m..... 14. a simple sugar which is an important energy source 15. the ability to move quickly

Down 1. involving free oxygen 2. relating to the heart and blood vessels. 3. an instance of being injured. 4. something that uses a lot of energy 5. relating to or requiring an absence of free oxygen 7. the amount of energy you have 9. the red liquid that circulates in the arteries and veins of humans 12. the quality or state of being physically strong. 13. an organ the pumps blood through the body