Muscle contraction is the tightening, shortening, or lengthening of muscles when you do some activity. It can happen when you hold or pick up something, or when you stretch or exercise with weights.

What Are Eccentric and Concentric Contractions? Eccentric contractions occur when a muscle lengthens under load, such as lowering a dumbbell during a biceps curl. Concentric contractions happen when ...

View post: Leg Day Nausea Is Real. Here’s Why Your Body Rebels During Heavy Sets (and How to Stop It) Banging out reps is pretty straightforward, generally speaking. Lift the weight, lower the weight, ...