The soreness in your elbows means you need to work on the form of how your lifting. Don't swing your arms up or use momentum, do what you see people in videos doing, even if it's much harder.
Soreness is from damaged muscle tissue. Your muscle tissue is damaged through weightlifting and your body counterracts this by producing tissue to replace it; except that your body produces more muscle tissue than was there previously and in turn you grow larger muscles. Wait 'til your not sore anymore (usually 2 days, can be up to 5-6 if you've done something intense or if your just starting).
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