I've been following the 5/3/1 program religiously for the past four months and I'm enjoying the growth and new-found strength a lot. I've been following the "Triumvirate" variation provided in the 5/3/1 article and I've been supplementing the squats with Front Squats and DB Rear Lunges. The Front Squats are progressing fine, but I'm afraid I'm going to plateau soon with the DB lunges due to a combination of leg fatigue and grips.
I've been working on my grips during the deadlift day with Farmer Walks, so it's been helping with the lunges, but I'm wondering if I should switch to a barbell soon or just keep progressing with the dumbbells until I hit the max weight my gym offers.
Any suggestions, even to drink a cup of concrete and harden up with the lunges, would be appreciated. I haven't gone this heavy with my lunges in the past and I'm treading this new territory carefully due to injuries.