Victoria and David's youngest son Cruz took to Instagram to post a video of himself working hard in the gym with his dad and eldest brother Brooklyn.
The pre-teen could be seen using a rowing machine to exercise fairly vigorously, visibly huffing and puffing as he worked up a sweat.
Dressed for the occasion, the 12-year-old sported a black on black gym outfit, featuring sports leggings layered under Adidas shorts with a black t-shirt.
The clip, which was captioned simply, 'Gym with @davidbeckham @brooklynbeckham 😜' has had 196,527 views so far.
But despite the youngster appearing to enjoy himself, some fans have voiced concerns that he is too young to be working out in a gym, with some worrying that he should be enjoying his childhood and taking part in sports instead.
One follower commented on Cruz's age, having turned 12 in February, 'He like 11 that must not b healthy'.
Many more agreed with similar comments such as 'You're still a child', 'You are too young for this' and 'How old is he'.
Others were even worried for Cruz's health, with some commenting with fears that using gym equipment at a young age could damage his growing muscles.
One fan wrote, 'Its actually bad to work out when your a kid your muscles get damaged' and another said, 'Its not good for the health of a little child'.
However for one follower it was Cruz's childhood that seemed most at stake, writing, 'ur like 10 eat a donut 🍩 and hav a child hood concentrate on that when ur 14'.
Another Instagram user seemed to agree, commenting on the idea that children generally get their exercise from sports and not inside a gym, 'Do sports not gym!'
Would you let your 12 year old use a gym? Do you think some exercise is better than no exercise? Let us know your thoughts in the comment box below.