Physiological research has uncovered disturbing evidence linking a number of structural disorders to jogging.
Conclusion
The human anatomy is not able to withstand the stresses of jogging.
Evidence
Research has shown a disturbing link between jogging and various structural disorders, such as spinal disk displacements, stress fractures, joint deterioration, and tendonitis. Both new and veteran joggers suffer these injuries at equal rates.
Evaluate
The author is suggesting that because both beginning and experienced joggers suffer injuries, jogging itself is inherently stressful to human anatomy. They are concluding that these injuries point towards jogging placing undue stress on human bodies.
A critical piece here is whether the link between jogging and these ailments is actually causal rather than just a correlation. The author's conclusion implies causality: jogging stresses the body in ways it can't handle.
To evaluate this conclusion, think about objections: how could we argue that the human anatomy can withstand jogging stresses? Maybe the purported link between jogging and injuries isn't causal. Perhaps factors other than the inherent stresses of jogging are at play (like specific techniques, footwear, or surfaces jogged on).
Goal
Look for an assumption stating or supporting that jogging is indeed causally linked to the injuries listed. Alternatively, find something that implies no additional factor explains the link between jogging and injuries, reinforcing that the mere act of jogging is responsible.