Heart Monitor

[doctorhawk]

What are your opionions of heart monitors? I am wanting to use one to improve my work out. Improve my heart speed. I would be using it on the machines in the gym. I would want one that could record my rates and help keep me in rage. I find that these gages can help me. I have heard the one major problem with polar is you have to send them in when the battery goes bad. Is this true. I would appreciat any insights on monitors I should look at or why they are not helpful.

Thanks,

Gisele