Glenn
I don't own these ideas - I give them freely - its just the engineer in me. and if you like them enough to call your own, well plagiarism is the highest form of flattery.

bigb
When ever yer ready pal. I'm 61 and I can probably kick yer tail.

broadway
big people have big muscles and you may have less body fat than you think, however I was trying to say that bones and guts are genetic factors and the ratio of muscle to lean body weight is not fixed, but it would take a dip in a tank and lots of measurements to determine those factors so as a rule of thumb, lean bady mass times some percentage less body fat is probably a better estimating method than just 1/4 of total body weight.

Jim YMMV and modern bpers are not in the shape that us hippy street people were. If I may be so callous, sport climbing was invented for moderns who didn't have what it takes to be trad climbers...