Assuming that you are doing a whole-body strength routine, you should work your lower body first. The rule is this: work larger muscle groups before small muscle groups. Since your largest muscle...
According to copyright laws in most countries, "musical works" are specifically listed among protected works. The intent of copyright is to encourage creativity, and music is certainly creative.
To me it depends on whether you want to work or not. Remember that when you get a job you have to be there everyday you cant be late. Sounds easy huh? Well think twice, you'll be working for the rest...