This passage is from 6 minute English by the BBC:
But because I know that is not good for my health, I do also like to go to the gym a couple of times a week and I will do some exercise like a bike ride, playing football at the weekend.
Why did not the host just say I do some exercise...? I am a little bit confused because it does not seem like a promise, but rather a habitual thing. Does the present and future tenses mean the same thing in this context, or the use of the future simple has some shade in meaning?