I have to agree with IW, the overall volume of your leg workout is going to contribute greatly to your DOMS. and proper nutrition will help to decrease them.

Another point I would make is, you trained for 7 weeks for a 10k, then jumped right back into the gym and started high volume squats and leg presses after the race. Your legs will likely need more time to recover after the training and 10k you did. It may be smart to drop your volume and weights down for a week or two and due a suedo deload to allow them to recover fully, or take some time off completely.

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