A friend of mine was in police academy and got jacked from doing nothing but bodyweight exercises. A lot of the above exercises people mentioned are great for that.
Also, if space or equipment is an issue try some yoga. I've sort of gotten into it through some Youtube videos and a lot of the strength-building exercises are pretty tough on you and even 20 minutes of it will kick your ass.
Also, if space or equipment is an issue try some yoga. I've sort of gotten into it through some Youtube videos and a lot of the strength-building exercises are pretty tough on you and even 20 minutes of it will kick your ass.