I would agree with much that is written here... the only caution flag I see is that when you rely on the Holy Spirit to teach you how to act, what pleases God, what doesn't etc, you need to remember that the Holy Spirit has done this primarily through giving us the Holy Scriptures. Many people have tried to justify all sorts of nonsense by saying "I feel the Lord led me", or the Holy Spirit is leading me to do x, y or z as if their connection to God was infallible, and that made everything they did and said infallibly of God as well. For while we are new creations when we are born again, we are still sinful creatures and the "promptings" we feel may or may not be of the Holy Spirit. There is only one way to know if they are or aren't', and that is to check those promptings by the very standard the Holy Spirit has given us, namely the word of God. Especially as a new Christian you will need this guidance. People will, even with the best of intentions, steer you wrong. You are responsible to check everything anyone says, including this post, by the word of God.
Now it is also clear that every single detail of our lives is not explicitly covered by the Scriptures. You are worried about having a toned body for instance.... well someone else rightly said that our bodies are the temple of the Holy Spirit and we are to honor God with our bodies. The context of this is a discussion regarding fleeing sexual immorality:
1 Corinthians 6:18-20 (ESV) [18] Flee from sexual immorality. Every other sin a person commits is outside the body, but the sexually immoral person sins against his own body. [19] Or do you not know that your body is a temple of the Holy Spirit within you, whom you have from God? You are not your own, [20] for you were bought with a price. So glorify God in your body.
So the passage is really not a justification for working out and being ripped. However it is also not an injunction against it either. In this situation you will have to watch your own mind and heart carefully. Are you really prideful about your body? Is it a source of great pride to you to be really physically fit? We are to take care of all that God has given us, including our bodies. But if we obsess about it or it interferes with our devotion to God and a life of sexual purity, even if no actual physical contact ever takes place, for sexual immorality can occur solely in our thoughts, say for instance if we want to be noticed and have the opposite sex lust after our bodies and so we dress in ways that feed this attitude, then we need to reevaluate our priorities. Here is an example: I had a friend who had a Mohawk
there is nothing inherently wrong with having one, but my friend really started to examine the reasons behind why he had one. He realized that he was doing it to draw attention to himself, and to try and shock the sensibilities of those around him. Eventually he felt that he had to get rid of the Mohawk, not because the haircut was itself inherently sinful, but because the reasons he had it. So only you can answer the why behind why you want to have a toned body.
Be that as it may, the larger point is just that I would just encourage you to avoid an overly subjective approach to your new found Christian faith, and use what God Himself has given us; namely the word of God and the teachers the Holy Spirit has given the church. The Westminster Confession says:
Q3: What is the word of God?
A3: The holy scriptures of the Old and New Testaments are the word of God,[1] the only rule of faith and obedience.[2]
1. II Tim. 3:16; II Peter 1:19-21
2. Eph. 2:20; Rev. 22:18-19; Isa. 8:20; Luke 16:29, 31; Gal. 1:8-9; II Tim. 3:15-16
Q5: What do the scriptures principally teach?
A5: The scriptures principally teach, what man is to believe concerning God, and what duty God requires of man.[1]
1. II Tim. 1:13
Blessings,
ken
