Well, I know a spell, one cute witch once casted it on me. However, that spell just made me happy to do the hard stuff for several months.
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it turns out 90% of magic is just creatively hiding your work through misdirection or extensive prepwork and the other 10% is straight luck.
extensive prepwork
In this case, 'hard stuff'…
The trick is to do the absolute minimal amount, but to do it daily. Then, if you feel like it on any particular day, do more. If you don´t, thats okay.
In case of workout that would be "Do exactly one pushup or similar exercise".
It´s applicable to basically anything you want to get into a habit of doing. "One minute of concentrated practice on your instrument.", "Two verses of poetry.", "Ride the bike for 100 meters.", "One line of code.", "Memorize one variant of a chess opening.", the list goes on.
Just don´t begin too many things at once. The above are only menat as examples.