Center Marcus Martin, shown here in November, said he is now in the best shape of his life after an offseason dedicated to better fitness.
Center Marcus Martin, shown here in November, said he is now in the best shape of his life after an offseason dedicated to better fitness. Tony Avelar AP
Center Marcus Martin, shown here in November, said he is now in the best shape of his life after an offseason dedicated to better fitness. Tony Avelar AP
On the 49ers

On the 49ers

The latest Niners news with Chris Biderman

Marcus Martin’s transformation a necessity in fast-paced 49ers offense

June 10, 2015 09:11 AM