Q: Should I exercise my muscles in any particular order?
A: It’s usually best to exercise large muscle groups (such as thighs, chest and back) first, since they require more effort—but routines vary.
You may also want to exercise the muscles most important in your goals first—for instance, “core” muscles in your torso, if you’re trying to strengthen your back and/or tighten your abdominals.
Always work opposing muscles. That is, if you work the quadriceps (front of thighs), don't forget the hamstrings (behind the thighs); biceps and triceps are another opposing pair.