Future offspring already having the genetic makeup would be the result of what I'm suggesting, specifically.
This may help to better understand if I can explain it well enough.
The genes that a person has is their genotype and inherited from their parents with about 50-100 mutations that didn't come from the folks and are novel to the individual. Some of these mutations may have a benefit or may even be detrimental, but most will be neutral. These did not arise from any will, training or anticipation of future environments.
We have a genotype that is our individual gene sequence. These genes are expressed in what is us as the phenotype. The expression of genes or the phenotype has some plasticity to it. We change as we age for instance. Though some of that change is regulated and dependent on the timing of expression, but that is more detailed and time consuming to go through in a simple explanation. And honestly, beyond the scope of a mere entomologist to explain well. However, what you have been discussing is alterations to the phenotype which has some plasticity and can respond to the environment (training for instance is an environmental change) without a corresponding change to the genotype.
Great athletes have the same genes they started life with. Their training has been on the phenotype and the results are the enhancement of that. Just as changes that occur with aging are examples of the same sort of plasticity different only in the basis for the change. Working out, eating right and maintaining optimum activity levels can alter or slow the inevitable results of that natural plasticity to a degree. A lot I hope as I get older. But my genes are not going to change.
Edit: My apologies, I made some glaring errors in this as I typed it out. I hope I have corrected them all.