jennyboone

Personally, I use the Polar heart rate monitor (around $100) as well as several of my friends and we all love it! I have had it for two years now and are just now needing replace the watch battery.

The question is how long have you been doing strength training? You definitely need to switch it up, never work the same muscles every day, your body needs time to recover. If you have been training for a while, add a little more weight. You might be at a plateau. Definitely keep it up, don't stop!