You should use a spotter with most heavy free weight strength training exercises in your weight training routine. A spotter is there to insure your safety during weight training.
Spotters should help you complete your last strength training exercise rep, if necessary, help you rack the bar, and help you control the weight if you falter. Competitive and/or very strong lifters may need 2 or 3 spotters.
However, for noncomeptitve strength training, if your spotter assists on every rep, it is not "all you" and you are not doing as much work as you should. Use less weight and do the weight training conditioning yourself. You should rarely need a spotter on machines.
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