Even on your non-cardio days, your muscles must be warmed up before you can safely, and most effectively, perform strength training exercises. No matter what, always perform at least five minutes of whole-body sustained exercise before targeting specific muscles with free weights, resistance machines, or even intense calisthenics. Even if you are really tight on time, it is always better to shorten your workout than to shorten your warm-up. Play it safe and start up slowly.
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