The ability of standing long jump may largely depend on many factors, including physical development, strength, coordination, technical mastery, psychological state and so on. You can jump 2.6 meters in junior high school, which means that your physical fitness and technical level were relatively high. However, with the passage of time, physical and technical changes may affect your long jump performance.

There may be several reasons why I didn't jump 2m 3 in college:

Physical development and strength changes: From high school to college, your body may have undergone obvious changes, such as the increase or decrease of height, weight and strength. These changes may affect your long jump performance.

Technical retrogression: Although you can jump far in junior high school, if you don't continue to practice and improve your skills during college, your long jump skills may regress.

Psychological factors: psychological state may affect your long jump performance. If you feel nervous and stressed during the competition or exam, you may not be able to play your best.

Other factors: In addition to the above factors, there are other factors that may affect your long jump performance, such as venue conditions, weather conditions, fatigue and so on.

To improve the performance of standing long jump, you can try the following suggestions:

Make a training plan: Make a training plan for standing long jump, including strength training, coordination training and technical training. Through systematic training, you can improve your physical fitness and technical level.

Practice Skills: Seriously study the technical essentials of standing long jump and practice it frequently. Pay special attention to the skills of take-off, flying and belly-in.

Strengthen strength and coordination: through proper exercise and practice, strengthen the strength of thighs, waist and abdomen and improve the coordination of the body.

Keep a positive attitude: keep a calm and positive attitude during the game or exam, and don't be too nervous or stressed.

Pay attention to details: pay attention to the humidity and temperature of the venue to avoid factors that affect the long jump performance. Do enough warm-up exercises before the game or exam to prevent possible injuries.

Finally, don't neglect safety measures. When doing any physical exercise and training, we must ensure the correct technology and safety measures to avoid possible injuries. If you are confused about your long jump ability, you can consult a physical education teacher or coach for professional guidance and advice.