It always sounds as a good idea planning the beginning of your workouts to Monday. New week, new start.
More often something happens over the weekend though and your launch is compromised. Maybe, it is your body fighting against planned discomfort, maybe it is just a coincidence.
In the last 5 years it happened to me several times.
I planned a start of a new regiment for Monday, enjoying the weekend and bang. Next day I woke up with a fever, pain in the chest, sore throat or something similar. My body and mind did not want me to start something so terrible as working out.
When planning a new routine, start the next day. Don’t wait for the weekend or next bank holiday. Even though you want it and look forward to heal your body, you incautiously worry about the outcome. As you do when presented a new project or a plan for some adventure.
Our bodies are programmed for self-protection. Without that we would not survive in the past nor even now.
Once you decide to change your life, do it right away. Don’t wait for a better time. There’s never been a better time even though your body and mind want you to believe something else.