The typical solution to making an exercise or given weight harder is to do more reps, run farther, workout longer, etc. The problem with this approach is that there comes a point where you can only spend so much time training per day, and the ‘more is better’ approach eventually leads to running out of time and or overtraining/injury.
There is an elegant solution that requires far less time while providing a higher return for your investment.
Over the years as an instructor/coach/teacher I’ve noticed a particular phenomenon where some very experienced students begin to lose confidence in their skill sets although it’s clear that they’ve come along way and accomplished a great deal while novice students are typically over-confident despite their relative lack of skill. I’ve seen it time and time again where people who are objectively much better than they have been in the past perceive they are no good or getting worse. The perception of getting worse or better at a skill is often a matter of choosing your perspective and objectively tracking your progress. If you’re not tracking your workouts and objectively measuring progress, then the only standard you are judging yourself against is perfection and you’ll never measure up.