EQUIPMENT

I bought some equipment over the decades.

Some things are still in use, some were fun and some were expensive rubbish.

MUST HAVE 

HR-chest-strap / monitor 

to know my daily readyness, to be sure i'm training in my daily individual optimal intensity and to check the (short- and longterm) results of my routine

TOP

1

trail-running-shoes

for combining endurance-training with priceless experiences in nature 

2

9 x 1x1m thick floor-mats / puzzle-mats

for shadow-boxing, heavy-bag-work, yoga, gymnastics, BWEs, TGUs, (...)

3

spinning-bike

for countless hours of "no-excuses-bad-weather-road-work" combined with watching movies

4

barbell with weights

for lifting and getting stronger

5

adjustable Kettlebells (1 x 8-16kg, 2 x 16-24kg)

for lifting, carries, holding my feet on the ground doing sit-ups, weight for my DIY-cable-mashine, (...)

6

pull-up-bar

for pull-ups, hanging-leg-raises and to attach gymnastic-rings or my slingtrainer

Yes, it's not necessary to own any equipment, but some things help a lot to save time and make the whole process much more productive.

A gym-membership, commuting and the waiting-time to get access to a certain "mashine" cost money. Essential equipment is cheaper. 

There's nothing wrong with a gym-membership, you just have to realise that, if time and / or money is important to you.