I am touching up on a few things
Specially the lifting arms part..
More tips? yes?
Like I always say dividing stuff up always makes it easier to remember. Do it piece by piece. Learn the basic shapes then when you are comfortable go to the next level and learn how the muscles join. Then all the fiddly bits. Always good to have an anatomy book with you and also draw from real life and photographs so you can see variance in the human form.
I only drew one body type here though it will still have the foundation for any body type. This one I use in particular...well because I like drawing it
and also it shows all the muscle structures XD
Practice practice practice :'D I am having weird urges to start a fan service series......again....