Seeing the Opportunities in Yoga

In just a few weeks, New Year's will be upon us with a wave of 'challenges' being tossed at us left, right and center including for our yoga practices. As wikipedia defines, "A challenge is a general term referring to things that are imbued with a sense of difficulty and victory". The concept of 'difficulty' doesn't resonate much of a positive tone, does it? When achieving some state of victory, then what? Now that I can put my foot suddenly behind my head, am I suddenly that much more closer to enlightenment? Rather than integrating this concept of overcoming 'difficulty', would we not be better served to approach our practice with a sense of opportunity instead?