1 Timothy 4:8 For bodily exercise profits a little, but godliness is profitable for all things, having promise of the life that now is and of that which is to come.

I don’t believe Paul was an exercise guru!
He didn’t have bulging muscles.
He didn’t sweat for hours lifting weights, walking a treadmill, or working out infront of a talking mirror.
He probably did plenty of walking by traveling place to place and sharing the Gospel, which he believed was more important than bodily exercise.
I played a few sports. I really loved volleyball. I was a pretty fast runner and had fairly quick reflexes.
Looking back, I wish I had spent even more time studying the word of God.
In the mix of things it is the single most important knowledge and life to live.
Mind you, I had fun playing what little sports I did. It’s great recreation.
However, sports comes in seasons, while Jesus is year round.
I believe you should physically take care of yourself.
Perhaps share the Gospel while pounding the machines at the gym.
But the strong and the weak are treated equally in life when it comes to dealing with death.
It effects both.
And after death the only thing that matters is your relationship with Jesus Christ.