It’s all about the toolbox…
One thing that I’m really happy with is my toolbox - now this isn’t any reference to Linford’s Lunchbox (Mark’s toolbox doesn’t have quite the same ring to it 
No - my toolbox is basically my list of options for when I’m training. I’m not stuck with one or two routines. I now know how to train all my body in one session, or how to focus on certain areas when required.
I can train with or without weights, indoors or outdoors, cardio or strength or stamina or fat burning. It is really important to understand the different effects of the different training schemes. It is also super important to make sure you change the scheme every few weeks so you don’t plateau. Also, if you have an injury you can avoid training or damaging it until it heals - just by understanding what each specific exercise is doing and which muscle groups it is using.
My toolbox gives me confidence that I can tackle anything.