To keep up with some basic exercise, I've been regularly doing a fixed number of pushups (increasing a little over time).
The quality of my form is admittedly quite sloppy, I'd not say they are "cheating" (where you only move the top half of your body, or even just bob your head up and down, I'm sure you know the sort!). But they aren't slow and controlled either - I'm not lifting my body 100% to straight arms - and moving it all the way down either (maybe ~75% of the motion at a guess).
While the same number of fully controlled pushups is obviously harder then less controlled movement, is there a strong argument to favor controlled exercise assuming you're equally as tired after both?
Or is this simply different exercise? As 'crunches' are different to full 'sit-ups'.
I'm asking this because for me it's motivating to set a number and reach it every time, If I'm tired I have worse form, if I'm feeling energetic I have better form. But at least it keeps the exercise regular and it gives me some goal to reach. However I'm wondering if poor form could be harmful in some way, or if there are significant reasons to force myself to do less reps with better form.