For the spell caster on the go without time to spend preparing or getting into range we here at daily fantasy ideas recommend "Magical Fist"
For most it's simple, just cock your your punching arm up with your other arm pointing at your elbow to form an L type shape. Then just bawl those hands of yours into flist and focus your magic into the punching hand and voila! There you have one magical fist ready to be thrown.
But warnings of course apply, you cannot be stealthy with this as the punch connecting triggers loud bang as a result of the explosive energy release.
Also performing too many acts of magical fisticuffs in to short a time span will permanently damage your arms and shoulders and chest. But to counter this one needs only reinforced their body and then my friend you will be able to fist and pummel away.
Why I've even heard of a "Magical Fist Storm" where you launch strike after strike after strike at a target. But summoning all the magic energy to reinforce your body and then do that must take quite a toll on someone, though I could imagine summoning that much strength from within if it'd allow me to punch rush someone who I truly despised.