forget about it
breaking his back
Justin Bieber is hot.
what obstacles did jaime escalante have
secrecy...
The preposition "to" typically goes with the word "obstacle". For example, "There were many obstacles to overcome in completing the project."
"Insurmountable" means that something can't be overcome, as in an "insurmountable obstacle".
he acted normal and he became normal.
Galileo's biggest obstacle
Strong opposition from opponents in Congress
taylor swifts greatest obstacle to over come is being rejected by record labels
The most challenging obstacle you have had to overcome may have a huge impact on you. You may have learned to become better at communicating because of this experience for example.