One important aspect many people forget about while working out is their body posture. How your spine is set during your lifts can have a huge impact on your body and the amount of weight you're able to lift. A healthy spine usually stems from a strong core. If your core is weak, then your spine doesn't have any support. When you're lifting - even during movements as simple as a bicep curl - engage your core. You might feel like you're just flexing your abs, but you're also engaging those deep, inner core muscles that protect your spine. Always be aware of your body posture!