Start and finish soft
In any training always start at a very smooth pace, and go increasing the intensity throughout it.
To finish the training, try to do at the end of it a few minutes of soft exercise of the sport you are doing.
Do not forget about warm-up and stretching
It is very important that you spend time in each workout to warm up and stretch, so you can prevent injuries and also doing stretching exercises, you can run, and swim better.
The technique, a fundamental part of training
Dedicate a part of the training to practice running technique, swimming, cycling, although it does not seem to be practicing this type of exercises, you will improve your efficiency of each sport and thus you will be able to obtain better results and with the same effort to run and swim faster, avoid injuries , etc.
Pay attention to your body
Sometimes the training, work, and social circumstances that surround you influence your performance, and may make you feel tired, unmotivated, etc.
In these cases, it is important to pay attention to your body, and if it asks for rest, give it to them. Nothing happens to lose a day of training, it is even beneficial in some cases.
Do not try to recover the lost training
If you have never been able to do a training session, do not try to recover it by doing twice the next day, let it go, do the planned training and do not think about it anymore, you will not lose your fitness.