When I left corporate life, I thought the hardest part would be replacing the income. I expected the hard part to be building a client base from scratch, learning to sell my own expertise instead of someone else's brand and working out which of the dozen ideas in my head was worth pursuing first, and those were real challenges. But the thing that nearly derailed everything had nothing to do with strategy or sales. It was the state of my body.
On paper I was healthy. I exercised a few times a week and ate reasonably well, and I slept enough to function. By corporate standards I was doing fine, which is exactly the problem with corporate standards. I had the fitness of someone who was managing health around a career rather than organising a career around health. There is a significant difference between those two things, and I did not understand it until I tried to build a business on the foundation I had.
The invoice nobody warned you about
A corporate career sends you an invoice. It does not arrive in an envelope or land in your inbox. It shows up in your body, as weight gained so gradually you stopped noticing, sleep that went from deep and restorative to shallow and broken, stiffness you blamed on a bad office chair rather than a body running on stress hormones for years, and headaches you treated with paracetamol instead of asking why they kept coming back.
Paul Millerd, who writes honestly about leaving the default path, put it well in The Pathless Path:
"I told myself I was smarter than other people. … I always took all of my vacation days. Didn't work crazy hours. Made time for friends and family. … On my final day of work the feelings that flowed through my body told me I wasn't so clever."
That resonates because many senior executives believe they are managing it. They are not ignoring their health completely. They get annual checkups, they have gym memberships, they take holidays. But the Health Invoice is cumulative. It is the bill for fifteen or twenty years of stress, travel across time zones, meals grabbed between meetings, and sleep sacrificed for early morning calls with the other side of the world. You can defer payment for a long time, but the body always collects eventually.
Why this matters more than your business plan
Here is what I have watched happen to people who skip this step. They leave corporate full of energy and ambition. The first few months feel like freedom. They work long hours because now the hours feel purposeful. They tell themselves this is different from corporate because they are doing it for themselves.
Then the wheels start to come off, and I mean the physical wheels, although the business ones go too. Decision-making gets worse because fatigue accumulates without the structure of a corporate calendar forcing breaks. Sleep deteriorates because there is no separation between work and everything else. The diet slides because nobody is booking lunch meetings anymore and it is easier to eat at the desk. Stress increases because now the financial pressure is personal rather than abstract.
The people I have seen crash hard in their first year tend to say the same thing. It was not the strategy that failed but the body underneath it. Poor sleep led to poor judgment, which led to poor decisions, which led to poor results. The business plan was fine, but the engine running it was not.
The point is simple: you perform at your best when you look after your body. That sounds obvious, and it is, yet few people leaving corporate treat their physical condition as the first thing to fix before building anything else.
Organising work around health, not health around work
When I was a Group CISO, my health routine was built into the gaps. I would exercise if the schedule allowed it and eat well if there was a decent option near the office, and I would sleep properly if there was no red-eye flight or 5am call with London. Health was something I managed around the edges of a career that owned the centre of my life.
After leaving, I had the chance to reverse that completely. For the first time in decades, I controlled my own calendar. That meant I could put training, sleep, and nutrition at the centre and build everything else around them. The shift from managing health around a career to organising a career around health sounds like a small change in wording, but it changed how I structured every single day.
Morning training stopped being something to squeeze in before a 7:30 standup and became a non-negotiable that the rest of the day worked around. Sleep became a fixed boundary that decided when work stopped, rather than something that happened after I finished answering emails, and meals became part of the system that kept my thinking sharp enough to build something worth building.
A practical protocol that works outside corporate
This is not a fitness programme or medical advice, and there are better qualified people than me to write those. If you have a health condition, talk to your doctor before you change how you train or eat. But after two years of treating health as the foundation rather than a side project, these are the four areas that made the most difference to my ability to build a business.
Movement that serves your brain, not just your body
The reason exercise matters for entrepreneurs is not primarily about looking good or even living longer. It is about how well you think. For me, thirty to forty-five minutes of moderate to intense movement in the morning sets up several hours of sharper thinking. The research is more modest than the motivational posts, but it points the same way. A meta-analysis of 79 studies found a small positive effect of a single exercise session on cognitive performance, and regular exercise is linked to better brain health and cognition over time.
I train six days a week now, a mix of strength work and cardiovascular conditioning. The sessions are not long but they are consistent, and they happen before any work begins. On the rare day I skip training to start work early, the quality of my output drops noticeably by midday. The trade-off is never worth it.
Sleep as a performance system
In corporate, I wore poor sleep like a badge without realising it. Five or six hours felt normal because everyone around me was doing the same. Sleep specialists recommend at least seven hours a night for adults. After leaving, I discovered what seven to eight hours of genuine quality sleep does to problem-solving, emotional regulation, and the ability to handle setbacks without spiralling.
The practical changes were straightforward. I kept a fixed bedtime and wake time, even on weekends, kept screens out of the last hour before bed, slept in a cool, dark room and stopped caffeine after midday. None of this is revolutionary, which is exactly why it works. The difficulty was never knowing what to do, it was giving sleep the same priority I once gave to preparing for a board presentation.
Nutrition that supports sustained thinking
Corporate eating habits are often poor, and you do not notice how poor until you stop. The combination of travel, client dinners, conference catering and stress-driven snacking can leave your energy uneven throughout the day.
I am not going to prescribe a specific diet because what works varies from person to person. What I will say is that once I started eating with the specific goal of stable energy and clear thinking rather than convenience or social obligation, the difference in my afternoon productivity was dramatic. That meant fewer processed foods, more protein and vegetables, consistent meal timing and significantly less alcohol, which are simple changes with compounding returns over weeks and months.
Stress management when the safety net is gone
This is the one that catches people off guard. Corporate stress is real, but it comes with buffers, like a salary that arrives regardless of how the week went, a team that shares the load and an infrastructure that handles the things you do not think about. When you are building on your own, stress becomes more personal and more variable. A bad month is no longer an unpleasant performance review but a direct hit to your income and your confidence.
The tools I use are boring and effective. I take daily walks that are separate from training, specifically to clear my head, and I keep a strict boundary between work hours and personal time, because without a corporate calendar enforcing that separation it disappears instantly. I also take regular time away from the business, even when there is pressure to keep pushing. The ability to absorb stress without breaking down is not toughness but a system you build deliberately, and it starts with the physical foundation underneath it.
Your body is the business
If you are still in corporate and planning your exit, start here, with an honest assessment of what your body has been carrying and what it will need to carry when the safety net of a salary and a structure is gone, before the business model, the website or the audience-building strategy.
The transition period, those first months after leaving, is the best opportunity you will ever have to fix everything you have been deferring. You control your calendar for the first time in decades. Use that control to build the physical foundation that everything else sits on. If your body is not ready, the best strategy in the world will not save you when fatigue turns into poor judgment and poor judgment turns into decisions you cannot take back.
Health is not a chapter you read and move on from but the operating system every other chapter runs on, including the one where corporate becomes optional.
If you want an honest read on where you stand before you plan the exit, the free assessment below takes about five minutes.