1. Multiple Linear Regression

2. Specifically >>Multiple Linear Regression<< when M>1 for in specific M simply referred to as >>Linear Regression<<

3. What is it you want to model? You could limit the model to people capable of completing the race.

and then make another model - logit - predicting whether or not a person will complete the race.

4.Not a problem for multiple linearI'm uncertain if the problem is linear in the known characteristics.

regression. The model is called linear because it is linear in the coefficients not in the characteristics. Put in som quadratics

and check if coefficients are significant.