Just to set the stage, there's really no way to minimize fat gain at any given time by adding in any exercise while you are eating at a surplus.
Over a week, say, it may be possible. But, over that week, you minimize the fat gain via exercise and a short period of time in a caloric deficit. The fat gain "minimized" is really fat that was lost during that short period of the deficit. It's a little cycle you got going.
That being said, sprinting isn't a method of exercise that's going to burn a lot of fat while you are doing it. It generates EPOC that will help put you into a deficit that may burn off some fat. But, now that you've sprinted and need to let the EPOC do it's thing, you need to go for quite some time without all that food that you need to get yourself "unskinny." That's detrimental to that goal. The unskinnying one.
You may have some luck cycling calorie levels and doing some cardio or sprinting on the days when you can put yourself into a deficit, but it's tricky. After a workout, you gotta eat. The day after the workout (to continue to unskinny yourself), you gotta eat. With four days, you've got little time left for that brief deficit.
Thursday morning (assuming a PM lifting session) might be good for eating light and cardioing somehow. Assuming rest on Sat, you could sprint Sunday and eat lighter until close to your ME work that afternoon/evening. But, now you've sprinted pretty close to your ME work. That's three CNS intensive days in a row.
You could also eat less and just find the sweet spot to minimize fat gains. Maybe a little lower calorie-wise and cardio on Sunday or Monday and then Thursday mornings.
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Lost Dog's Blog & Workout Log
Superman never made any money
saving the world from Solomon Grundy
and sometimes I despair the world will never see
another man like him
-Crash Test Dummies. "Superman's Song"
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