His pleasure is not in the strength of the horse, nor his delight in the legs of a man;  the LORD delights in those who fear him, who put their hope in his unfailing love.

God doesn't really care if you're strong. You could be a wimpy person. you could be crippled. But that's how he made you. If you're naturally wimpy, that's OK. Now, if it's you re fault, like if you re eating a lot of sugar, and you know you're gaining weight , and you really don't care in the least, well,  You are a temple for the Lord and God also said to take care of you're body.