But many people over do it.
Using a treadmill or similar is a good start but a better strategy is to do warm up sets with the exercise that you will be doing.
An example would be as follows, if you are doing Bicep curls then start with an empty bar for about 5 reps, next set add some weight and do 5 more reps.
Do 3-4 warm up sets and keep the weight low, this will get you ready for your working sets without draining your energy.
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