A lot of people seems to be pushing themselves a bit too much and hurt themselves when doing weights. From reading a few article and some past experience a quick way of knowing when you are doing too much weights is understanding your body.
For example you have to see the responce of your body when lifting the weights around your 5th time, if you feel that your are making faces or your body or muscle is shaking drop down a few weight and just increase your rep.
Example:
if you are doing some triceps lifts starting at 25kg, your first 5 lift will seem easy but when you reach the 6th or 7th lift you seem that you are struggling to push it all the way up. You would normally feel a shake on your arm. Drop it down and drop a block of weight down to 21kg and do another 1-2 sets of 8 or 12 depending on what you had planned. I normally plan for 3 sets of 12 but if i feel I can’t do the new weights I go for 3 sets of 12 on a lower weight and 2 more sets of 8. This is good if you want to increase your endurance.
