What is 'fitness' anyway?
Fitness is the ability of your heart, lungs and muscles to sustain effort over time. The fitter you are, the longer you can keep going before you're out of breath — whether that's climbing stairs, a game of football or a day of heavy lifting. The good news: fitness responds quickly to training. You often notice a difference within two to three weeks.
Start calm and build gradually
The biggest beginner mistake is starting too hard: three tough sessions in the first enthusiastic week, then a week of muscle soreness and dropping out. Your fitness improves precisely by building up consistently and gradually. Start with short, doable sessions and extend them a little week after week — more minutes, slightly more intensity, or one extra session.
The 10% rule
A rule of thumb that prevents injuries: increase your training load by no more than about 10% per week. If you run 30 minutes total this week, aim for around 33 next week. It feels slow, but your tendons and joints need time to grow along with your fitness. Building up too fast is the leading cause of shin splints and overuse injuries.
Vary the intensity
Your heart gets strongest when you train it at different levels. Combine calm endurance training (long, at a pace where you can still talk) with shorter, more intense blocks like intervals. That variation delivers results faster than always the same pace, and it's a lot less boring.
A simple beginner plan
An example for your first weeks, two to three times a week: start with 5 minutes of easy walking or cycling to warm up. Then do 20 minutes alternating easy effort with shorter stretches at a firmer pace (for example 1 minute faster, 2 minutes easy). Finish with 5 minutes of cooling down and stretching. Feeling good? Add a few minutes each week.
Don't forget strength
Fitness isn't only about cardio. Strong legs, a stable core and good posture make every movement more efficient, so you tire less quickly. Two short strength sessions a week — squats, lunges, core exercises — support your fitness and protect you against injury.
Stay consistent (and make it fun)
Fitness is built with regularity, not isolated peaks. Two to three times a week is enough for most people to notice a clear difference within a few weeks. Schedule your sessions as fixed appointments, pick something you enjoy, and find a training buddy if it helps.
Want to be sure you're building up well and injury-free? At our studio in Zwanenburg we build a plan together that fits your starting level and goal, and adjust where needed. Parking is free and you train in peace, without queues.
