weight and speed

Seen on www.shealynnbaird.com: YOUR health is YOUR choice:

Obviously there is a negative correlation between weight and speed, though speed depends e.g. also on muscle power and strength. However, when I had been 8 kg lighter, the calculator on a website would suggest, I had a 20 min faster race at a marathon distance. The calculator shows how much one gains/losses speed by additional/less body weight assuming all other parameters are unchanged (muscles, ...). http://www.runningforfitness.org/calc/

When I just think about it, any extra kg is a lot of resistance to carry for 42kg/26.2 miles. In a second step I compared then my BMI (bmi=32, age=35) to the average man:


Again it is very revieling and gives food for thought, less for my body...