Here are 13 encouraging short sentences in English for sports and motivation:

1、"Never give up on your dreams of athletic excellence. The journey is worth the effort."

2、"With every step you take, you're making a statement about your resilience and determination."

3、"Push your boundaries, not your limits. Your body is capable of more than you think."

4、"Success is not final, failure is not fatal; it’s courage that counts."

5、"Stay strong and motivated, for the journey ahead is filled with potential and opportunity."

6、"Exercise not only builds strength, it builds character and resilience."

7、"The hardest part of any athletic challenge is the first step. Take it with courage and confidence."

8、"Success is a journey, not a destination. Enjoy the process and be proud of every step."

9、"Success always prefers the determined and persistent."

10、"Train hard, race better. Never settle for less than your best."

11、"Remember, hard work and perseverance pay off in the end."

12、"Challenge yourself, push your limits, and never stop moving forward."

13、"Your body is capable of more than you can imagine. Believe in yourself and achieve your dreams."

Each of these sentences encourages the spirit of perseverance and determination in sports and life, reminding us to never give up on our dreams and to keep pushing forward.