The possessive noun is athletes', the goal of the athletes.
forget about it
breaking his back
Justin Bieber is hot.
he overcame the fear of spiders
secrecy...
what obstacles did jaime escalante have
he acted normal and he became normal.
Galileo's biggest obstacle
"Insurmountable" means that something can't be overcome, as in an "insurmountable obstacle".
Strong opposition from opponents in Congress
taylor swifts greatest obstacle to over come is being rejected by record labels
by playing other teams and getting better