Peace burqaposhx
If you see this narration your assumption is misguided ...
Az-Zubayr bin Bakkaar said in his book An-Nasab, "Rukaanah ibn 'Abdi-Yazeed was the one who wrestled the Prophet (sallallaahu 'alayhe wa sallam) in Makkah before he embraced Islaam. He was from the strongest and harshest of the people. He said, 'If you can take me down, I will believe in you.' So the Prophet (sallallaahu 'alayhe wa sallam) wrestled him and took him down. He then proclaimed, 'I testify that you are a magician!" Later he accepted Islaam.'"
It is well known amongst Muslims that Muhammad (SAW) was not a weak man !!! Never was a weak man.
Few comments.
- How old was Messenger pbuh when the said context took place.
- Our Messenger pbuh had clean habits, and thus was healthier compared to many men of his age. Remember someone having an age of 60+ in the era of 1400 years ago was pretty good. 60+ back then is kind of comparable to 90+ these days.
Still---- (read below)
- Our Messenger pbuh was a human being, and thus he went through the same age related changed in His body like other human beings. Not sure what you mean by "Never a weak man". Any human being in his old age will lose the powers of his youth.