"The true soldier fights not because he hates what is in front of him, but because he loves what is behind him." - G. K. Chesterton
We all have to fight battles of some kind or another. For some people, this is a real, physical battle between armies. For most of us, though, the battles will be much less dramatic. It's the day-to-day struggles, whether they be physical (i.e. lifting weights) or mental (i.e. not doing something you really want to do, or doing something you really don't want to do).
The important thing to keep in mind as you fight these battles is what is motivating the struggle. Is the fight coming from a mindset of hating what's in front of you, or of loving what's behind?
This will affect the outcome in more than one way. For one thing, fighting by hating what's in front of you is like trying to paddle against the current. But loving what's behind you is like letting the current carry you - I think it's fairly intuitive that, with the same amount of effort, you're going to get a lot further in the latter setup than the former.
Even more interesting is the fact that these motivations will play a part in how you feel after the battle as well. Battles won by hate won't end in satisfaction - they end in exhaustion, and then at the end of it there's no one cheering. But battles won by love come with a reward at the end - you get to celebrate with the person/people/thing you fought for.
When you're examining your battles, think about why you're fighting them. It'll make a big difference on whether you win, and where you'll be when you do.