The cause is frequently unknown. Hypertrophic cardiomyopathy is often and dilated cardiomyopathy in a third of cases, is inherited from a person's parents. Dilated cardiomyopathy may also result from alcohol, heavy metals, coronary heart disease, cocaine use, and viral infections.
Consider the number of reps. You can also confuse your muscles by increasing or decreasing the number of repetitions you do during any given exercise. For example, if you normally do 12 repetitions, do 15 or 18 repetitions, but with a lower weight than you would normally use.
A woman is riding a stationary bike. Nerve damage symptoms don't need to stop you from exercising, but they do pose some limitations on which exercises you can, and should, do. Nerve damage symptoms can include muscle weakness, pain, numbness and tingling. Nerve damage can also inhibit your proprioception, or ability to sense position, and therefore you can more easily injure yourself exercising without realizing it.