The San Francisco 49ers held their first padded practice of training camp on Saturday. It goes without saying that it was the most physical session of camp thus far. Here's what you need to know from Day 3.

1. San Francisco's running backs had a banner day. Jerick McKinnon had one long reception down the left sideline from C.J. Beathard. He had another run up the middle where he exhibited patience while waiting for a crease to open up. Matt Breida flashed on several occasions as well. Breida took one carry to the left and made a smooth cut upfield for a big gain. On another play, Jimmy Garoppolo avoided pressure and delivered a sidearm pass to Breida up the left seam. Not to be outdone, Joe Williams ripped off a 65-yard touchdown run on a toss to the left that marked the offense's play of the day. Shanahan praised Williams' decisiveness on the play during his post-practice presser.

2. Padded practices means the return of cornerback vs. wide receiver 1-on-1s. Receivers who showed well include Dante Pettis, Victor Bolden Jr. and Marquise Goodwin. Pettis was very smooth out of his breaks and created easy separation. The drill, especially with a quarterback as accurate as Garoppolo, is designed for the offense to win. However, Tarvarus McFadden, Adrian Colbert and D.J. Reed Jr. all showed very well in coverage. McFadden nearly had an interception and Colbert was able to come away with a sideline pick on a pass from Nick Mullens to Aldrick Robinson.

3. Garoppolo took two deep shots for Goodwin during full-team work. The first was down the middle that was a bit under thrown and Ahkello Witherspoon was able to break up the pass. The second was thrown out of bounds down the left sideline where he didn't give Goodwin a chance to make a play on the ball. While Garoppolo is surgical on short and intermediate throws, there's still plenty of work to be done on his down-field shots. Shanahan said post-practice that the best way to improve is to give Garoppolo more opportunities in practice. The 49ers head coach wasn't concerned about the missed opportunities on Saturday.

4. As expected, the offensive line held up better in pass protection with pads on. DeForest Buckner, Solomon Thomas, Jeremiah Attaochu and Eli Harold still flashed on various reps.

5. Pettis' strong showing in 1-on-1s continued in full-team work. He had several short-to-intermediate catches while working both sides of the field.

6. Reuben Foster and Fred Warner each had an emphatic run stop during 11-on-11. The linebackers showcased their speed to blow up two separate running plays.

7. Aaron Burbridge has quietly been very solid over the first three days of camp. He's had a handful of catches over the last two practices, including a few connections with Garoppolo. The fact that Kyle Shanahan and John Lynch have kept Burbridge around indicates that they see something in him. He's still a long shot at a roster spot, but he's worth keeping an eye on. Remember, he was a special teams ace on punt coverage as a rookie in 2016.