| No. | Item | Definition |
|---|---|---|
| 1. | 10K | ten-kilometer race distance |
| 2. | 5K | five-kilometer race distance |
| 3. | Achilles | tendon behind the ankle |
| 4. | aerobic | using oxygen efficiently |
| 5. | aid station | race stop for fluids |
| 6. | altitude | height above sea level |
| 7. | anaerobic | high effort without enough oxygen |
| 8. | base | foundational endurance training |
| 9. | bib | race number worn visibly |
| 10. | blister | fluid-filled skin irritation |
| 11. | bonk | suddenly run out of energy |
| 12. | breathing | air intake during running |
| 13. | build | period of increasing training |
| 14. | cadence | steps taken per minute |
| 15. | chafing | skin rubbing irritation |
| 16. | chip | timing device for races |
| 17. | cool-down | easy activity after exercise |
| 18. | corral | grouped race starting area |
| 19. | course | the race route |
| 20. | cramp | painful involuntary muscle tightening |
| 21. | crosswind | wind blowing from the side |
| 22. | dehydration | too little body fluid |
| 23. | DOMS | delayed muscle soreness |
| 24. | downhill | sloping descent while running |
| 25. | drafting | running behind for wind shelter |
| 26. | drills | practice movements for technique |
| 27. | drop | heel-to-toe shoe height difference |
| 28. | easy run | relaxed low-intensity run |
| 29. | electrolytes | minerals aiding fluid balance |
| 30. | elevation | height gained on a route |
| 31. | endurance | ability to sustain effort |
| 32. | fartlek | unstructured speed-play training |
| 33. | fatigue | tiredness from exertion |
| 34. | finish line | end point of a race |
| 35. | footstrike | how the foot lands |
| 36. | form | running technique and mechanics |
| 37. | fueling | taking in energy while running |
| 38. | gel | portable concentrated race fuel |
| 39. | glute | buttock muscle used in running |
| 40. | glycogen | stored carbohydrate fuel |
| 41. | GPS | satellite-based location tracking |
| 42. | gun time | time from race start signal |
| 43. | half marathon | 13.1-mile road race |
| 44. | hamstring | muscle at back of thigh |
| 45. | headwind | wind blowing against runner |
| 46. | heart rate | beats per minute |
| 47. | hill | incline used in running |
| 48. | hydration | body fluid balance |
| 49. | interval | workout alternating hard and easy |
| 50. | jog | run at an easy pace |
| 51. | kick | final burst of speed |
| 52. | lap | one circuit of a course |
| 53. | long run | extended distance training run |
| 54. | loop | route returning to start |
| 55. | marathon | 26.2-mile road race |
| 56. | midsole | shoe cushioning layer |
| 57. | mileage | total distance run |
| 58. | negative split | faster second half pacing |
| 59. | net time | time from crossing start |
| 60. | out-and-back | route back the same way |
| 61. | outsole | bottom shoe contact layer |
| 62. | overtraining | too much training, poor recovery |
| 63. | pace | speed maintained while running |
| 64. | peak | highest training phase |
| 65. | plantar fasciitis | heel and arch pain |
| 66. | posture | body position while running |
| 67. | PR | personal best performance |
| 68. | progression | run getting faster gradually |
| 69. | pronation | inward foot roll after landing |
| 70. | quad | front thigh muscle |
| 71. | race | competitive running event |
| 72. | recovery | rest and repair after effort |
| 73. | relay | team race with legs |
| 74. | repeats | multiple hard running segments |
| 75. | rest day | day without training |
| 76. | RPE | rating of perceived exertion |
| 77. | shin splints | pain along the shin |
| 78. | split | time for a segment |
| 79. | sprint | run at top speed |
| 80. | stability | support against excess motion |
| 81. | stamina | physical staying power |
| 82. | stitch | sharp side pain while running |
| 83. | stride | one running step length |
| 84. | surge | brief increase in pace |
| 85. | tailwind | wind pushing runner forward |
| 86. | tempo | comfortably hard sustained pace |
| 87. | threshold | effort near sustainable limit |
| 88. | toebox | front shoe area for toes |
| 89. | track | oval running surface |
| 90. | trail | off-road running path |
| 91. | treadmill | indoor moving running belt |
| 92. | turnover | rate of leg cycling |
| 93. | ultra | race longer than marathon |
| 94. | uphill | sloping climb while running |
| 95. | VO2 max | maximum oxygen-use capacity |
| 96. | volume | overall training amount |
| 97. | warm-up | easy activity before exercise |
| 98. | watch | device tracking time and pace |
| 99. | wave start | staggered race starting method |
| 100. | zone | training intensity range |
