17 y/o been doing bjj and mma for about 8 years, started 5x5 in summer and am now lifting 6x a week. Went from 60kg (132lbs) to now 66kg (145lbs).

I’m now pretty big, ripped and have abs. Starting to cut down on sugar too. Been wondering about incorporating HIIT cardio into my training. Is anyone else doing this? Has it impacted your size gains at all? Any advice about HIIT appreciated. Cheers