When investing, you are rewarded for taking risk by an increased rate of return.
When working out, you are rewarded for pushing to your limits and enduring the pain by increased muscle growth and strength.
Only risk that can't be diversified away results in a higher return.
Only pain that can't be avoided by warming up and stretching results in muscle growth.
Invest smart, diversify into low-fee index trackers.
Train smart, warm up and stretch after you are done.