Greetings! Pain is a message that we are beyond a personal limit. Why do we have personal limits?
Let's take the example of the muscles and other sub-components of the body that relate to motion and strength:

If we are inactive for an extended period, we will likely be weak and when we come to do exercise, we will likely feel discomfort and maybe some pain because the body is very efficient and has used it's resources for healing while there was inactivity instead of for making the body able to perform athletic moves. Our limits will be small until we strengthen the muscles, yet to strengthen the muscles involves reaching their limits and many will prefer to go beyond the limits of the muscles to be a 'body builder' - whereby the muscles rebuild ever larger following them being pushed beyond their limits.

However, another option exists with regards to exercise which results in a greater balance than will typically be achieved using the 'body builder' approach and that is yoga. Traditional yoga is carefully designed to not really push us beyond our limits, but to instead work WITH the body to gently glide up to the body's limits and then allow growth without pain being needed. The word 'yoga' is commonly translated as 'union' since it refers to a union of the aspects of self, particularly the mind/spirit and body/will. By balancing these two aspects we do not have a mind that pushes the body too far (causing pain and injury) and we have a body that knows it's needs are listened to and so is more relaxed about stretching it's limits. The abilities of advanced yoga practitioners can sometimes be described accurately as super human and part of that is that their uncommon balance has allowed their limits on all levels to be greatly extended. A body builder, however, will typically only excel at strength and 'looking muscled'. The body builder (who has gotten big by pushing self) may not be able to sustain aerobic exercise for very long and may even have reduced flexibility and range of motion due to imbalanced body transformation.

My point here is that while it is possible to grow through having exceeded limits by being pushed, there is a price to pay for such imbalance and limits will be reached which need not exist. Alternative options do exist which are balanced and which will allow far more growth in preferred ways. Usually, a main difference between the two options is that one will consciously involve the heart of the individual being used to listen and feel carefully to all the inner signals, whereas the other will not fully involve the heart and will rely on more on following protocols, commands, a 'trainer' or other external source of stimulation. The path of the heart results in real balance and empowerment on multiple levels, whereas the alternative is more likely to end up in imbalanced growth and over reliance on the part that has grown at the expense of other parts that have been denied.

I could have explained this in many different ways, but this is just one that many can relate to.