"Your body is your creation......it exists solely to serve you." What a cool and empowering quote from Mike Dooley's inspirational book Infinite Possibilities. I know from experience how you can sort of feel stuck in your body.
If you reflect on how you dress it's easy to see how your clothes and accessories are an expression of who you are and how you think about yourself. You want your style to reflect who you are. It's not that different with your body. Your body is also an expression of who you are. But in contrast to the clothes you step into and out of, you can't extricate yourself from your body, at least not until you leave this lifetime.
From a spiritual perspective your body is not you, you merely inhabit it for the duration of your stay here on Earth to enjoy and experience your time here in the physical. But realizing that your body is an expression of you over which you have a lot of control is a freeing realization. Your body clearly reacts to what you put into it, what you're exposed to environmentally, how and if you move, and what thoughts you feed it. And just like your style changes over the years, your body changes over the years too.
If you modify the way you nourish yourself your body will change - think weight change and better or worse general physical health. If you decrease or increase your physical activity level, or change the type of physical activity you do (say body building versus dancing), your body changes - think toned muscles, increased energy, flexibility and endurance versus loss of muscle mass, energy and stamina. Changes in your exposure to environmental toxins influence your body - think better physical health versus respiratory ailments, nausea, headaches or perhaps even cancer. Your body even changes if you change your thoughts - think more exuberance, charisma and positivity, which will make you look younger or more radiant versus depression or anxiety, which will show up in your physical demeanor.
You and your body are a team that's joined at the hip so to speak. The closer you work together towards a mutual goal the more your body will reflect who you want to be.