What is a good alternative exercise to weight training and running?

Can you answer Bman31164’s question about Bodybuilding?:

I’m a 44 year old man and I work out regularly at a gym about 5 days/week. My routine consists of weight training followed by running on a treadmill. I feel like my training has hit a plateau over the last 2 months. What is a good alternative to weight training and running that might help to shake things up and shock my body out of this plateau state?

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