The lion's speed is about 80 kilometers per hour. However, some deer girth sometimes rises above 85 kilometers. Even then, the lion hunts the deer. How do you know?
When a lion chases the deer, then when the deer runs back, it looks back and forth, to see how far the lion is and how far away. That is why Deer's speed decreases.
On the other hand, the lion looks at the deer running in front of him, "I'll catch him if he is too late". The lion's strength and focus increased. And at the end of the day, the defeat of the deer gets defeated near the lion's hunger.
source
If you look back later, you will not be able to come forward any day. If you come forward, you need to look forward to the front, need to concentrate in front.
Forget the shocks
Turn around in education
Test yourself!
And wait to be good.