If you'd rather not fight for kettlebells at the gym or just want to work out at home, one well-chosen kettlebell is versatile, compact and pretty cost-effective. You just have to sift through the myriad sizes, brands, styles and weights. Here's how to tell what matters and what's useless.

Everybody has a somatotype, or a genetic body type, that predicts their aptitude for certain fitness activities and goals. Knowing your somatotype might be good information to have, but don't put too much stock in it. You'll only limit yourself.

Genetics explain a lot of the differences in strength and muscularity between person to person. Specifically, the size of your frame, how many muscle fibres you're born with and how well you respond to training essentially separate you from your gym buddy or someone who can squat 454kg.

If you can hold a plank for ages and crack walnuts with infinite sit-ups, you've got good core strength. But a strong core is more than brute-forcing your way through ab exercises. Your core needs stability to protect you from injury. In other words, you need core strength and core stability.

Video: All the curls in the world won't build your biceps if you aren't eating enough protein. But how does the food you eat benefit your strength? This video breaks down what's happening in your body when you down that post-workout shake.